Coming up with a clan tag in the age where clan tags need to be unique...

Hi guys,

How do you come up with a clan tag in scenarios where you need more than the usual 3 characters or in cases when your obvious choice is taken and you need a unique one?

My community has recently decided to expand to League of Legends and the obvious clan tag we've using is taken. I have no idea what to fall back on in these cases. So how have you dealt with a situation like these?

My community is named "Hound of Abaddon" with the obvious clan tag being "HoA"

Thanks for you assistance :)