Lay Baby Lay uses a black pegboard to display her rock and geode collection, but you could use it for any small item you've got a lot of. It's simple, classy way to show off what you love.
crystal + mineral collection in handmade shelf display by stone + violet on etsy
Create a Seashell Collection Box
Building the Rock Collection Display
DIY Pegboard Rock Collection Display For E's rock collection
rock collection organized by color / Sacred Spaces