Guests at the Marriott in Irvine, California can stay in a 'Splash of Brilliance' room equipped with the device. It's not terribly fancy: Like any glass door, it gets foggy during a hot shower and becomes a makeshift canvas to doodle on. Guests can save whatever they sketch out to a file in a paired tablet, whether it's casual notes or serious architectural plans.

To its credit, this lo-fi solution is likely a lot cheaper and simpler than sticking a waterproof tablet setup in every shower. The pilot program will last for the next two months, and may be rolled out further depending on feedback.