Do you have a big collection of LEGO minifigs? You could leave them hanging out on a shelf where they can easily be knocked over, or you could display them on one of these shelves designed specifically to keep their feet from sliding around.
Neatoramanaut Dennis shared pics of Super Mario-themed shelves that he and his girlfriend Judith put together for their apartment. Actually Judith did almost everything. And Mama Mia, what a piece of woodwork:
The shelves and cloud are all made of wood, while the mushroom, Mario and Luigi figures were store bought; naturally, the princess is missing.