While it isn't the cheapest way to go, for Mini-Cons, Micromasters, Decoys, Mini-Spies, and so on I really like these:
https://www.michaels.com/10147365.htmlAs a general recommendation? Experiment! Once you find decent shelving, you have your template but the rest is open to your imagination. Maybe check toyhax.com and the Toy Stages section. Or wander a Container Store or Ikea for risers and lights for a showcase kind of look. What would it look like to display bio cards or tech specs? It can be a fun journey if you have the space and time, so Martha Stewart this thing and find what will make it yours!