Since my computer is an essential part of my life I allow myself the luxury of "dressing it up." My first purchase was a lovely case via Etsy from the wonderful TillyMoss. It is covered in gorgeous Amy Butler "Morning Glory" fabric and 100% Irish linen. Even several months later, I couldn't be happier with it!
I also change my desktop background depending on my mood so I try to accumulate a large collection in which I can choose from. I recently found Kindred, started by Heather "Ez" Pudewa of Creature Comforts and Holly Becker of decor8, where they display seasonally themed desktop wallpapers designed by themselves and fellow artists. There is a wide selection of wallpapers to choose from, in addition to free downloads of notecard and thank you card designs.
Below: All from www.thekindredsite.com Top left: By Hadley Hutton Top Right: By Danna Ray Bottom left: By Amy Ng Bottom Right: By Heather "Ez" Pudewa.
These backgrounds are from Farmidable. You tile the squares in order to create a repeating pattern on your screen.