Well... Hmm.. What I would do would be make a couple designs of different Alice in Wonderland characters and use them as tiles on the ground... Or make it have a grass ground, a blue sky and have a little rabbit hole design on the ground! Have a long table with many tea sets on them and a lucky golden cat nearby with a top hat on a chair or something.
Anything to do with playing cards and chess, those are major themes in Alice. Bright colors, flowers, and mushrooms are a pretty big theme too. If I remember correctly, there are chess pieces as furniture items, and you could easily make playing card designs.
Try having the whole forest theme, then find a rabbit or racoon if u cant find the rabbit. A lucky cat, then dress up in a suit and top hat if your a boy, or a blue dress if girl.