how about endlers? there exactly like guppies but smaller. my endles love to follow the school of tetras around, trying to find some female endlers amognst the tetras. they look neat too! it seems like tehy have alot more of a metalic shine to them, unlike most guppies ive keept.
https://www.liveaquaria.com/product/...fm?pCatId=1584
theres a link to the little guys. ive herd of people finding them with teh "wild" feeder gupies.
EDIT: endlers can cross with gupies but i dont sugest it. so makeshure you dont have any female gupps or you might get some realy strange guplers.