if you arent doing a mural maybe get a whole bunch of different sized canvas's that have cars etc on them, that way you can put them all up on the wall, but move/rearrange them as you want.
Pretty sure Spotlight have some wall art type stuff, just remember off the top of my head what themes they have hun. Cotton ON kids have some from time to time too, we got dinosaurs but I think they change a bit from time to time.
I did DS1's in a race theme. I put up a removal race track on his wall & a race track mat. I'm fairly sure there are photos on my fb page if you want to have a look.
Bookmarks