Themes would be quite fun, but you'd need to announce the themes well in advance. Maybe the month before or the number of pictures may be limited.
I like varied and eclectic backgrounds. Nothing wrong with scenery and those do seem to get the votes, so others obviously think they're ok. But maybe a fun pic every third one would be nice? I like Polly Browns picture this month as it exudes happiness.
How about an Xmas special???? I'm sure Badman would enter for that?? He allegedly likes dressing up!!!!