The group's theme changes every two weeks. You'll find it in the "title" of the Group's page. Check in often!
This is a spinoff of sequential_nmbrs. Here you will find all the numbers that didn`t make it - either they were uploaded too late (or never because they have been there already) or they were not rule-compliant. They do not have to be in sequential order or unique, just numbers. And if you have a nice story to go with the picture, feel free to add it to the image description.