Well the thing about Figure is that you're limited to 8 bars, PERIOD. Slowest tempo you can do is 60bpm so if you're clever you can do 16 bars at an apparent 120bpm. I wouldn't generally consider them "finished" as far as songs go, but they're "finished" as far as Figure is concerned, since that's all you can do.
Sometimes hard limits are a good thing. Though personally I still really REALLY wish we could import Figure files to Reason (or export them as Reason files, either way). I'd love to work on some of those ideas more inside Reason.
Good suggestions also carlgrace, I don't tend to think of taking one bit from one idea and merge it with another from another. Might have to give that a whirl...