For anyone who finds themselves regularly stressed at their work desk, and who doesn’t have to worry too much about children or pets interfering with their desk furniture, I wholly recommend getting yourself a miniature zen garden, and a water feature.
I now have both on my desk here at Profero, and they have already helped me to de-stress my environment considerably. Raking the sand in my zen garden and contemplating the waterfall is really very relaxing, and helps me to focus my mind on a particular fine-grained problem by allowing my mind to de-clench the problem it has been going over too closely.
Work smarter, not harder. 
–c.
PS. Do check out my Flickr group for snapshots of your desk! It’s open to all – so take a snap and upload it to Desksnaps!