The only time I had figures on display was at work. I couldn't allocate enough space dedicated to smelly plastic at home, so most of my toys & action figures are boxed in storage. I've got most of the Playmates Simpsons & ST:TNG, a lot of Family Guy, a bunch of Anime toys from Japan, way too many 12" Star Wars figures from 1997, and a set of super cool 12" Batman The Animated Series figures that I should dig out.
Anyhow, here's my first office cube c.2002:
Once I moved into a real office, I decided to splurge on Ikea display cases (my expense account was quite small):
Fullmetal Alchemist figures
Ghost in the Shell figures
Death Note nendoroids, Villeta Nu from Code Geass, and the Reverend Putty puppet from Moral Orel.
Lastly, my collection of Ben 10 figures from all versions series.
The other shelves had mostly art vinyl (Tokodoki, Gary Baseman, Tim Biskup) and some silly nonsense.