I've seen lots of posts of various rejects. I've had many shots rejected and about 6 accepted. Like most of you, some of the rejects I feel are better than the ones they accepted, but that's okay (it's their site).
However, there's one shot I really like that they rejected and I thought it would be perfect for the site as it shows off both a specialty lens and the low-light capability and shake reduction of the K100D (IMHO). Is it great art? No way, it's just a fun shot but I like looking at the detail hidden in the shot. Anyway, here it is...ZZ Top at the Houston Rodeo in Reliant Stadium earlier this year. Taken with the DA10-17 fisheye zoom, 10mm f/5.6, 1/10sec handheld (from my seat). This is one of those shots that looks better bigger, in my opinion.