Here is a "side-by-side" comparison of the various graphics sets (a.k.a., "skins"). You can purchase them in the in-game Store on the Decorative tab for either real money or coins, and you can switch back and forth between them at any time after you've purchased them. Note that not all versions of the game have access to all the graphics sets.
|Default [Summer] Graphics||Fall (v1.89 and up)|
|Winter (v1.83 and up)||Spring (v1.87 and up)|
|Candy Country (v1.90.0 and up)|