Have you tried the Random Gallery yet?
On days that I'm looking at the Photography Gallery, and I'm getting bored because the pace at which new images are being added is slow, I like to go to the Random Gallery. The thing with looking at the Gallery the regular way, is that you have to trawl through pages and pages of photos that you've already seen. Boring!
So, after checking the award galleries, the regular gallery, etc., I nowadays often check the Random Gallery. It's fun, because you can find wonderful images that you've never seen before. Except for Pete I don't think anyone on here sees every image that's uploaded, so using the Random Gallery can show you lots of photos that are totally unknown to you.
I added several really nice finds to my Favourites, and surprised a few photographers with comments on photos they uploaded years ago...
Where to find it: When in the Photography Gallery, go to the grey button Gallery List on the right, above the photos, and go to the left-hand row of galleries in the list, the option at the bottom. (Don't forget to use the grey Refresh button on the left!)