Two Kansas City color consultants (Duncan-Patterson and Touch of Distinction) have an eye for outstanding color schemes. Each has architectural sensibilities and will provide a hand-drawn color rendering so you can see your “new” colors before the actual painting begins.

Benjamin Moore's Color Makeover Portrait - Send a photo & $40 with their form and 2 weeks later you'll have a package with two color photos, color samples & software. Can't beat it.

Online Painters!
Sherwin Williams and Benjamin Moore both have online color tools - upload your own photo to see what your new colors will look like. There's also DIY software from BM ($10, Zeke's Paint) and Porter Paints ($10, Gragg's Paint).

With the Digital Color Wheel you can see the relationships between colors - why some look good together and others not.

Interiors?
HGTV has a easy to use overview of interior color - very helpful.