#1 important thing- try to relax. If you're worrying about how to make your sex life better, chances are you're placing far too much pressure on yourself during sex to make it spectacular, and that puts a damper on things.
Try not to think of sex for awhile, actually. Don't plan anything, don't expect anything. That way, you'll get horny when you least expect it, and the sex will most likely feel great.
As for creativity, I always feel the greatest when I surprise my boyfriend (ie., when waking up beside me in the morning, he wakes up to me either giving him a blowjob, or me riding him). Sometimes quickies can feel exciting and really liven things up.
Hmmm...not sure what else to think at the moment. Just try to relax, and hopefully things will go your way