Multiple accounts!
I love this app. Helps with my stress a lot. Although I think you should be able to have multiple accounts, all sharing one email so if you have premium you get to keep it on all accounts. So basically the same algorithm as Instagram. Another idea i had us being able to make your own colors into live colors as well. Just some suggestions :)
AlexaCamille about
Recolor - Coloring Book, v4.2.3