In meta I see there are some photo contest ideas (an event, picture of the week). The reward for winning these contests is that the winning photo will be placed in the header image for a certain time.
Does the SE design allow to rotate the image in the header throughout the day? I visit Photo.SE several times per day and it would be fun if every time (or every n-th time) I visit the site, a different header pops up. This would expose the images of 2nd and 3rd (and maybe 4th, 5th, etc) place winners as well and it would keep the site header more lively.