Membership Icons

Does anyone know how to change the membership icons without deleting the entire membership and starting all over?

I tried to find the source, but it seems hashed or something?

I can tell you that the reside in this directory.. You can just re-upload the new one with the same name as the old one.

media/images/membership/

Ah, i found them ;-) Yes, they were there. Just with a random number.jpg. Thanks!