More Colors, Please!!!
I understand that a while ago you added new colors, but we really need more options!
Also, I think it'd be GREAT if you either changed the (Only) yellow to a brighter or prettier shade (At the moment it's not very bright or pretty) or add a new, brighter shade of yellow in addition to the other one.
I've seen a lot of people suggesting a color wheel, which also seems like a great option!