What to do, what to do...

I've been visiting galleries more frequently lately and I'm seeing lots of encouraging work out there...and some not so much. I guess I hate the idea of trying to make my work commercial in some way. It's not necessarily a bad thing, it's just annoying.  The thing I'm really struggling with is having a body of work with a theme to it that every exhibition has. Every time I have an idea, I become uninterested after one or two paintings so I don't know what I'm going to do... Actually I do sort of have an idea but I don't want to jinx it by saying anything so I'll just leave it at that.