[RoxyTBDW]

Free to colour adoptables. =3 There are three background options; a forest, caves, or an animal shelter. There are two different options for cage doors for the shelter; clear doors and barred doors. There are also three different options for lines, with optional shading and lock alpha-able colouring layers for each. You're also free to draw your own animals.
I might add more backgrounds, lines, or other options later.

You can also colour them for yourself; you don't have to give them away. If you do that I recommend removing the numbers so others don't think they're up for adoption.
Have fun!