Alice in Wonderland?
sure! incorporating a public domain character like that is a great idea! :)
also the jam themes are always very loose and are mainly intended to spark the imagination so the reference can be quite small - for example, since you mentioned alice in wonderland you could just include a copy of alice in wonderland on a character's bookshelf, or some kind of reference to it (a pocket watch, a rabbit, etc)
or honestly, if the theme isn't working for you, you're free to ignore it altogether! >:D
good luck <3