I'm lucky to have a studio which I share with another artist. My desktop is actually a recycled door! It sits on top of two workhorses. I have space to work on my laptop and draw (or record) my iPad.
My favorite corner of my desk isn't necessarily functional, but more inspirational. I love rainbows and so I display this set of markers. I don't use them much (I mostly draw on the iPad), but seeing them displayed makes me happy every time I come in.