If any of you have used the new Windows Live Messenger, then you'll know what I'm talking about.

I'm making a messenger with a similar look. It's a blue colored theme that uses a single image as the background.

I'd like to let the user choose a color for the theme and have it apply that color to the image. Sort of like the Selective Color feature in Adobe Photoshop.

I'm somewhat familiar with DIB programming, but I'm not quite sure how to do this.

Any ideas?