I made an 'office'(computer use only)out of the closet in the bonus room/family room. I have shelves like you, and actually repositioned the shelves, removing one, and bringing another down to desk height~~I thought a desk would take up too much room since they're wider. I purchased a 3-drawer cabinet(could use a file cabinet)that fits perfectly under the 'desk'. You would probably have enough space to put a cabinet/shelf at each end, with a chair between the two. ;o)

Thanks for the reply patty cakes. I like your idea of using a shelf as a desk. I will probably just go with a small desk though, like the Parsons desk.

Any other advice or opinions? Thanks again...

If you've got your mind made up re:desk, then you should have it. My space is only about 3' deep, and w/a chair, I would have been sitting in the doorway~~I took the door off and have a curtain panel on each side.

There's a ceiling light, but I also hung wall lamps on each side wall for more direct lighting when using the computer. I have them about 8" from the top of the desk/shelf. I've also hung a large bulletin board on the back wall, with a few wall accessories/family photos. Oh, I didn't mentioned I painted the closet black, including the ceiling~~it makes for a very cozy space, as well as a topic of conversation. ;o)