I personally wear BareMinerals but that might be a little heavy for what you are looking for. If you go into one of their stores, they will give you a "make-under". Also, maybe go to a counter in one of the department stores. Tell them exactly what you want to wear and they will give some suggestions to you.
I think that just a little bit of eyeshadow can make the world of difference. You don't have to go dark or really bright, just stick with really light colors. I like pinks and purples. Also, try eyeliner! Don't go black but try brown. That will be natural and maybe give you just the look you are looking for.