I know the message boards are quieter lately, but many times you guys post a side sale and I want to talk about it. Or suggest another shirt that would fit the theme well...
That way if the side sale/theme only has like 8 or 10 choices, but there's a community discussion on it with 8 or 10 more... maybe you'd get some extra sales off of it.
For example, the Puntastic sale right now... I have a shirt featuring one of my all-time favorite puns, Soap Addict and while it might not be part of the sale, I would totally have mentioned it. I'm sure other artists would chime in with their related stuff, too.
Just a thought.