this sort of leeches off of the cosmetic ideas suggestion previously posted, but i want some votes to see if this is worth implementing.
clans could possibly be able to make an insignia either by uploading custom images (which would have to be moderated, of course), by drawing it in some sort of editor, or by using a pre-defined set of images that you can overlap and recolor. this insignia could then be put on to your uniform or (like in the cosmetic ideas suggestion) a charm that you can put on your gun, or both!
thanks to the idea of @otaku_kid, it could be a leveling reward for reaching something like level 5-10, depending on how leveling would work. this would restrict insignia to decently active clans that actually play blockshot.
please let me know what you think and what would be the best course of action for making insignia.