There are lot of creative solutions out there (just head to Flickr and search for Lego Minifigure display or something similar). Description from nubcakes.blogspot.com. I searched for this on bing.com/images
Vintage Keys, Keys, Keys! ~ Display in a shadow box. Hang a small picture frame with attached ribbon from them. Paint with a splash of color for an entire different look. Endless possibilities! Love it!