Unlike the PlayKids App, Coloring Book by PlayKids will not follow the same subscription model. Purchases will be one-time via In-App Purchase (within the app), in this case, packages can be purchased individually. A permanent benefit, which is associated with your Google or Apple Account after purchase, but will not be reflected in the Playkids App. So to access all the themes available in each pack, you will need to open them directly on Coloring Book by PlayKids.