Tap on the buttons to change the fur, eyes and the backdrop. There are a lot of different fur and eye colours on different skins, but if you want you can tap the buttons which say colour to change their colour. Drag the objects on the cat to add accessories, you can add scars (above the wizard hat). Tap on the objects to change their look. You can also drag the food to the cat and tap them to make the cat eat when she wants.
I was inspired by Warrior Cats at some fur patterns and scars.