Flower

I only just heard of this game from listening to the 1Up podcast. Here's the wiki for a description:

Each level takes place in a different flower's dream as it sits on the windowsill of a dull city apartment. As the player progresses through the game, the apartment and city gradually becomes more vibrant and colourful. The player guides a petal through brightly coloured, abstract fields by tilting the motion-sensitive controller, pressing any button on the controller gives a speed boost. The aim is to guide the petal into other flowers in the field, triggering an explosion of colour that spreads through the game world.
Flower utilizes the Sixaxis motion controls in the PlayStation 3 controller, and it is used to direct the flower petals around the map.