If you want a pair of fish and you dont want to go the LiveBearer route then you have to take a U-turn to Dwarf Cichlids!
Pair of convicts breed like bunnies but not so colorful, Kribs are good as stated above, Laetacara Dorsigers are good too but not colorful. You can find a Cockatoo Cichlid which is rare to find where I live they are gorgeous! I dont know if they breed easily which wont match your requuirements. Ask your mom about these few fish stated above search them on google and show your mom and cross your fingers.
If she says no then it was worth a try. Ill keep popping Dwarf Cichlids.

