I came across a really neat color tool at my local hardware store. It's from Valspar. They have these nifty overlays with different rooms and different exterior shots that you can overlay on the color samples you select.
What's great about this as opposed to the online tools is you get to see the actual color sample instead of a screen version of the colors. This is a great way to help clients visualize the paint in a room or on the exterior of their home.
They had 4 different exterior house overlays and numerous interior room overlays. The photo here is just one of the room overlays available.
What a fun and convenient color tool!