I recently was given a small private office at work. What are some novel suggestions for things to put in it?

I was recently given a small private office at work. It’s nothing fancy, but it’s mine-all-mine and I’m really pleased. I have all the standard office supply items and I think I’ve handled the decor (I’m big on vintage advertising and travel posters) fairly well too. I’m wondering though, if there are other interesting items, both practical as well as unusual, that you would suggest to make it more pleasant or functional. Do you or someone you know have something in their office that you thought was really cool or turned out to be really handy/enjoyable?

Bear in mind, there is no room for additional furniture. I’ve already brought in plenty of reading material. The only thing lacking I can think of at the moment is a fluffy pillow and a blanket, for those days when I’m tired or ill and want to nap on my lunch hour.(I can nap at work!! Oh joy of joys!)

I’ve love to hear your suggestions.