Painting your home is often one of the least expensive ways to make a noticeable--even dramatic--change to an interior. And if you'd like to match a paint color you see in a picture, Benjamin Moore's new iPhone app is ready to come to your aid. Load the picture into an iPhone or iPod touch, click match and scroll through an assortment of related paint colors, including light and dark shades.

Excellent demonstration of the potential of mobile phone computing. Sure, you could use paint chips, but why bother?

What apps could you create for your customer's phone? BuildIntel has some interesting ideas; what are yours?