Here are some great africans cichlids that have low aggression
and nice colors:
Pseudotropheus acei, a great fish that tend to hang around the surface a lot of the time.
Labidochromis caeruleus, amazing yellow and a peacful fish.
Neolamprologus leleupi, beautiful orange, nice and small but they can be very agressive to their own species but good with larger fish.
Aulonocara hansbaenschi, one of the most colorful and peacful africans you can buy, but watch out they may get bullied by other fish.
The ones to avoid:
Melanochromis Auratus, most Melanochromis are very aggressive but these can be psychotic.
Pseudotropheus lombard, these are stunning but like to pick fights with every fish in the tank.
(note these fish are great in same species tanks with a male to female ratio)
These are just my recommendations from personal experience , I have kept all these fish. African cichlids really have different personalities so you may get an acei that is aggressive or an auratus that is quite peacful.
Good luck with these cute little terrors from Africas great lakes :D