Here are two shot glass shelves I made that could be used to display anything you want that will fit. This shelf would make a good place to display your collectables.

Notice the dato joint used to connect the shot glass shelves makes a stronger joint.
Display shelf can be used to show off any small items.

The shot glass shelves pictured above and below are the same except where the one tall shot glass shelf is located. One has three shelves above and the other has three below. Both are stained with red mahogany with a top coat of semi gloss lacquer.

A shelf can be made to accommodate almost any size collection.
All joints are clean and flush.