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As others have asked, knowing the size tank you have will help us help you. Even if you have a 10g Endler's livebearers are small but very colorful but hardy at the same time. Also guppies would be a good choice, hardy and colorful.
I have a 20 gallon, and I was planning on buying a 50 gallon so if you could include multiple sets of beginner fish for both tanks that would be great!
20 Gallon - School of Tiger Barbs, or mix with Green Tigers, rock hard, super interesting fish, lovely colours, don't play well with others.
50 Gallon - Dwarf Cichlid set up, pair of either -Germans Rams, Bolivian Rams, Red Breast Acara, Apistogramma and some smaller fish like a few Cory and Tetra.