For years, coffee cup stains have been an unsightly pain in the ass that could only be defeated by coasters and furniture polish. However, designers Ink Julep and Jenn Perng have put them to good use with a series of PostCups postcards that can only be completed by the application of a coffee ring.
The new cards are available in Bicycle, Boy and Balloon, Cat, Ferris Wheel, Panda, Planet, and Snowman varieties and come in packs of seven.
Check out additional examples below.
Product Page ($17 via Laughing Squid)