What do you like to design?

For designers, we all have one thing we like to design above all other things. What is that one thing for you? For me, I like to design signature banners and themes. They are my top two favorite things to design. Over the last week I've designed 5-10 custom portfolio themes in Photoshop, and have yet to determine which one, if any of them, I want to use for my personal portfolio.