This is one of the most ingenious design concepts I've seen in a while: Stamp Cups. You know how you'll be enjoying a cup of coffee in the morning, when suddenly a tiny spill pools underneath the cup -- and, due to surface-tension stickiness, winds up staying on the cup and slowly leaving marks all over your tablecloth?

The Stamp Cup has a little floral design on the bottom, which turns coffee stains into instant, impromptu art. Cooler still, the two different patterns match up so you can join them -- slowly covering your tablecloth in a winding tapestry of art.

Of course, this means I'd have to get a tablecloth.

(Thanks to Sensory Impact for this one!)