so far I've been working on different recipes within the styles that I like. that lets me experiment, while still being able to remember the last 'brown ale' I made, so I can compare and try to improve.
I've got several recipes that are now house standards. They took a while to 'get right' but now they're pretty much static. I keep those on tap or in bottle all the time.
Everything else is experimenting, either to try new styles or in my further search for the elusive holy grail (in my case, the perfect stout). I love experimenting with recipes, it's when I'm having the most fun as a brewer I think.
I also crave variety so the experimenting helps there.