For some people, visualizing changes to a home’s exterior is easy. For others, though, there’s the Better Homes and Gardens Color-a-Home tool.

You could call it the Ultimate Geek Gift for an iPhone-toting friend — or even for yourself. It’s a set of 16 coasters made to look like iPhone application icons.

Using the Color This! tool at the Better Homes and Gardens website, visitors can mix-and-match swatch colors, then apply them to a room’s walls, floors, trim, cabinets and accessories.