I'm bipolar II. When I feel myself going into hypomania I try to catch it early and pop a seraquel before I go to bed. I learnt to pick up on real early signs, like when I can't stop talking, don't want to sleep, feel like socialising hard out. If don't medicate it, I try to stay away from situations where I'm gonna get way over stimulated. I know if I'm feeling a bit hypomanic and say, go out to a gig or a party, I end up even worse and it lasts longer. I usually say/do inappropriate stuff too.
I've been mostly good since I started lithium last year. It's done wonders for me, I used to be constant ups and downs and triggered into hypomania really easily. I get a lot more stuff done too. Having something like an antipsychotic to take the edge off the mania can help. Seraquel can bring me down from being way too high nicely. One of my main problems is stress, if I get too stressed or busy I end up either manic or depressed.
And yeah, the hypomania has often helped out my art practise. I think of amazing ideas when I'm high. Or at least I think they're amazing, often they're just...crazy.
Oh! Edit to add, I recommend the book "Overcoming Mood Swings". My pdoc recommended it to me, it's like a workbook to help you recognise how yr own patterns work. Really helped me out.