I've dug up these oldschool retail avatars, and I'm sharing them because I figure some of you might find them cool and/or nostalgic.
Q: How do I change my avatar?
A: Click on the "Settings" button at the top-right of the forum. It will be in between your user name and "Search". Once on the next page, scroll down a bit and go to the left side of the screen. Click on "Edit Avatar". This will take you to a page where you can upload an avatar to use for the forum. You can save one of these avatars to your computer, so that you can upload it to the forum, simply by right clicking on it and then clicking "Save As".
There are 4 images in each row. The images go in this order; Level 1, Level 60, Level 70, Level 80.
Druid
Spoiler:Show https://hydra-media.cursecdn.com/wow...7a8b5865d1ee46 https://hydra-media.cursecdn.com/wow...485411d598aef5 https://hydra-media.cursecdn.com/wow...94f4b5e07c43f4 https://hydra-media.cursecdn.com/wow...c963cf3b41a992
https://hydra-media.cursecdn.com/wow...94196734be68c6 https://hydra-media.cursecdn.com/wow...bac2105bae8127 https://hydra-media.cursecdn.com/wow...4fd38f3b9b24a8 https://hydra-media.cursecdn.com/wow...7ee5e26405d1cd
https://hydra-media.cursecdn.com/wow...fce9eec036d379 https://hydra-media.cursecdn.com/wow...97b9fd73b12f28 https://hydra-media.cursecdn.com/wow...c59a29b50869e3 https://hydra-media.cursecdn.com/wow...99a3c861f94f07
https://hydra-media.cursecdn.com/wow...a17801c88920cb https://hydra-media.cursecdn.com/wow...cd319d7d57c520 https://hydra-media.cursecdn.com/wow...8299b1bbc48bc7 https://hydra-media.cursecdn.com/wow...533e1d8c185458
Hunter
Spoiler:Show https://hydra-media.cursecdn.com/wow...37d3a7658d2e00 https://hydra-media.cursecdn.com/wow...8c4f54f5db33b8 https://hydra-media.cursecdn.com/wow...08a8c526a53ab3 https://hydra-media.cursecdn.com/wow...4effc94a9eb25a
https://hydra-media.cursecdn.com/wow...7e47d34aaeca43 https://hydra-media.cursecdn.com/wow...d4d77752817b09 https://hydra-media.cursecdn.com/wow...626486bab0e8e0 https://hydra-media.cursecdn.com/wow...dbc3b9f680e9db
https://hydra-media.cursecdn.com/wow...5d97b81f7db2ee https://hydra-media.cursecdn.com/wow...fae6855f45b2af https://hydra-media.cursecdn.com/wow...8262c7e286370f https://hydra-media.cursecdn.com/wow...48b8ff327464a1
https://hydra-media.cursecdn.com/wow...3460d9114d1ef8 https://hydra-media.cursecdn.com/wow...4e5143f60914fe https://hydra-media.cursecdn.com/wow...ecaf46361bdbfb https://hydra-media.cursecdn.com/wow...f361cbca3561eb
https://hydra-media.cursecdn.com/wow...0d6aad9e5939a6 https://hydra-media.cursecdn.com/wow...17d2060a6a404d https://hydra-media.cursecdn.com/wow...5887f019a71ed0 https://hydra-media.cursecdn.com/wow...44a6066fa1fed8
https://hydra-media.cursecdn.com/wow...f45a8dee9485c2 https://hydra-media.cursecdn.com/wow...5a01c65ddc8caf https://hydra-media.cursecdn.com/wow...a3220d4bc2387a https://hydra-media.cursecdn.com/wow...eb048fc33821a5
https://hydra-media.cursecdn.com/wow...46a9aa7cd2aadd https://hydra-media.cursecdn.com/wow...24a119aff55423 https://hydra-media.cursecdn.com/wow...62c75b5ccf4976 https://hydra-media.cursecdn.com/wow...0f177a52bd340d
https://hydra-media.cursecdn.com/wow...024bba9bdf7989 https://hydra-media.cursecdn.com/wow...65d5808a2caa08 https://hydra-media.cursecdn.com/wow...2e8ff1beda0253 https://hydra-media.cursecdn.com/wow...de85e64992eca4
https://hydra-media.cursecdn.com/wow...6fe4334c179131 https://hydra-media.cursecdn.com/wow...87fdc0c0539d33 https://hydra-media.cursecdn.com/wow...21bbf31788328f https://hydra-media.cursecdn.com/wow...d8ff5b98b009c4
https://hydra-media.cursecdn.com/wow...6ec88b2ffa95c4 https://hydra-media.cursecdn.com/wow...9578b3f3cc9128 https://hydra-media.cursecdn.com/wow...ec19fcecc00c8c https://hydra-media.cursecdn.com/wow...ff8831993305d6
https://hydra-media.cursecdn.com/wow...e662b9b422cf99 https://hydra-media.cursecdn.com/wow...ba215b36ed7f06 https://hydra-media.cursecdn.com/wow...1e33c08c8acca0 https://hydra-media.cursecdn.com/wow...04eb6215776862
https://hydra-media.cursecdn.com/wow...58550782fed9f1 https://hydra-media.cursecdn.com/wow...c64bab6c779a32 https://hydra-media.cursecdn.com/wow...3b96177329c2ac https://hydra-media.cursecdn.com/wow...f9441a63184937
https://hydra-media.cursecdn.com/wow...d983053e524b55 https://hydra-media.cursecdn.com/wow...22d27cc0ea188f https://hydra-media.cursecdn.com/wow...6cbfceb66738c5 https://hydra-media.cursecdn.com/wow...89cafd15aba5d4
https://hydra-media.cursecdn.com/wow...5828ac479da229 https://hydra-media.cursecdn.com/wow...78b3001dca253b https://hydra-media.cursecdn.com/wow...3499eb7f177804 https://hydra-media.cursecdn.com/wow...d1f3f7bba5e6ea
Mage
Spoiler:Show https://hydra-media.cursecdn.com/wow...65936b3524f52b https://hydra-media.cursecdn.com/wow...8e1696857c8f76 https://hydra-media.cursecdn.com/wow...24de3129ba0985 https://hydra-media.cursecdn.com/wow...6da5dfdf22176d
https://hydra-media.cursecdn.com/wow...1f8257172b788c https://hydra-media.cursecdn.com/wow...0174d63308ca15 https://hydra-media.cursecdn.com/wow...e7b66ce946bbca https://hydra-media.cursecdn.com/wow...67d872ed555982
https://hydra-media.cursecdn.com/wow...751bf83f6f5f24 https://hydra-media.cursecdn.com/wow...deba31ce21bfb5 https://hydra-media.cursecdn.com/wow...b41ee299df2030 https://hydra-media.cursecdn.com/wow...7752a47ad9cf94
https://hydra-media.cursecdn.com/wow...6fcdb6a37c2a23 https://hydra-media.cursecdn.com/wow...4d5cfdb8d23a3e https://hydra-media.cursecdn.com/wow...86b3c3eb7413a8 https://hydra-media.cursecdn.com/wow...f85172a93e8b8d
https://hydra-media.cursecdn.com/wow...69ad27405351e2 https://hydra-media.cursecdn.com/wow...f9d70a1b9b4789 https://hydra-media.cursecdn.com/wow...6a0a463719a0f0 https://hydra-media.cursecdn.com/wow...8611307823296c
https://hydra-media.cursecdn.com/wow...adb5f9657a2c11 https://hydra-media.cursecdn.com/wow...97725d1b8844c9 https://hydra-media.cursecdn.com/wow...00e02e4dafe1bc https://hydra-media.cursecdn.com/wow...5ab251a8240940
https://hydra-media.cursecdn.com/wow...8d42d93f815b05 https://hydra-media.cursecdn.com/wow...1cb8c60f2ae965 https://hydra-media.cursecdn.com/wow...ebcce659e062e2 https://hydra-media.cursecdn.com/wow...74e4b4f5006d12
https://hydra-media.cursecdn.com/wow...e38255bcfc1ef4 https://hydra-media.cursecdn.com/wow...b85dd32fe3e7f2 https://hydra-media.cursecdn.com/wow...d516d29cd04f9c https://hydra-media.cursecdn.com/wow...91aeef54764b68
https://hydra-media.cursecdn.com/wow...43bb6cb3e04b48 https://hydra-media.cursecdn.com/wow...791ed5385875b6 https://hydra-media.cursecdn.com/wow...642144b58258ad https://hydra-media.cursecdn.com/wow...9a3dda5eb081a6
https://hydra-media.cursecdn.com/wow...1616b371c744da https://hydra-media.cursecdn.com/wow...1bafd43ddee54b https://hydra-media.cursecdn.com/wow...6beb5fefe0defd https://hydra-media.cursecdn.com/wow...653d72ace7d09a
https://hydra-media.cursecdn.com/wow...1706c38f856309 https://hydra-media.cursecdn.com/wow...c8ec0bd97230bd https://hydra-media.cursecdn.com/wow...4222115377b141 https://hydra-media.cursecdn.com/wow...01c7e343e065ef
https://hydra-media.cursecdn.com/wow...45e9c382611942 https://hydra-media.cursecdn.com/wow...9129d4f9dc7f2a https://hydra-media.cursecdn.com/wow...91e486516e83c6 https://hydra-media.cursecdn.com/wow...b10582c0a65004
Source: http://wow.gamepedia.com/Gallery_of_player_avatars