As noted I personally prefer a white background for my desktop. And in considering other colors or background images I decided the work to do it was more than I was willing to do at the time anyway because all the stock images I found had the white background and doing the work to make them transparent didn't appeal to me. If there was enough request I would consider doing some different options but I have to point out that I am no Snarwars and I couldn't imagine being as good as him in these things so as long as nobody expects his level of work I would consider a few.