Personally, the graph paper design that is characteristic of many StackExchange sites, and currently is the background for Physics SE, is not pleasing to my eye. In fact, it has made me not feel as much like revisiting other StackExchange sites. I know that this is very subjective (and may stem from some deep-seated resentment of graph paper from school), but I find myself not wanting to visit sites as much that have graph paper or lined paper backgrounds.
I may be alone in preferring the plain background of Stack Overflow and Math Overflow. I'm not saying that this site should have the same site design as those sites, but do we need to have the same background as so many other SE sites? If you personally love the graph paper background, please state why rather than downvoting this question. If you would prefer something else, do you have any suggestions for an alternative background?