1) Contrasting colors are good. Makes it easier to read. Dark color text on light backgrounds are easiest to read (ie black on white)
2) Use the system colors if at all possible. You never know when a color-blind person is going to use your app. Odds are they'll have a color scheme setup that they can use easily. By supplying youir own colors, it makes it tough for them to operate the app.
3) Take your first scrn shot there, shrink it.... then put it on a form (background white) as a logo, then text around it.

-tg