We purchased this funny red lamp, the KILA lamp from IKEA, last year for our home office. It has served us well, and the weird wheels/rotating design make it a unique piece that's really easy to re-position, depending on your work needs.
Kind of a goofy look, but we've grown to love it. That feature - along with the great red color and $16.99 price tag - made it a must-have for us as we were setting up our office needs.
What are some of your home office essentials?? We need some more good ideas!