It may seem a little cruel to shut this poor little guy's tail in a book, but he doesn't mind. It's what he's there for.
Available at: http://hankodesigns.com/Accessories/OfficeAccessories/DClips.htm
These cute little sticky notes sell for $3.50 at Nothing Elegant.
Do your documents love you or love you not?
Available at: Papire http://papire.tumblr.com/post/490921155/animal-index-markers-designs-bear-dog ($1.80)
Spitballs? Please! If you really want to annoy your coworkers, fire circus people over the cubicle wall!