Do you have any specific photos of what you are seeking?
Sure, these are the ones from Alien Uprising:
And these are the ones from SCAM:
They're basically shallow colored trays the mini's regular base goes in.
I have a lot of prepainted DDMs with 1" bases and clix with 1.5" bases that I'd like to use as pawns in homebrew projects. Figured these would be nice ways to have a matching color between the mini's base and a role/hero sheet or power card.