The Dutch design firm Springtime invented this ice cream cart. The solar cells on the roof collect enough energy to keep the ice cream chilled:

The ice cream carts were designed to have a solar panel attached to the roof, which charges the batteries in order to keep the ice nice and cold on a hot summer day. The design team hope that the innovative vending cart will result in a energy-neutral solution for ice cream vendors all around the world.

Link -via Gizmodo | Design Firm's Website