Look at Elfa collection from The Container Store. They have small office space solutions for shelving, storage and desktop. It's on sale right now, and it's a great time to buy. Elfa goes on sale only a couple times a year. http://www.containerstore.com/elfa/index.htm

As for inspiration for how it could look or for doors. Use Houzz to its full potential. I'll get you started.
http://www.houzz.com/office-closet-converted