@barri: I have space issues too and kids!
I have a flannel backed plastic table cover that I picked up from the $ store. I applied sticky backed Velcro to the plastic side and did the same thing to the top of a window sill (hidden from everyday view).
Normally, I use it (plastic side up) to keep the dust off of my fabric cutter. When I need a design wall, I Velcro it up. Voila!