I recently started playing Gardens of Time on Facebook. Basically you travel through time (not in a Tardis) and build a garden, decorating it with different plants and objects. When you get to a certain level you can buy a Blue Police Box for your garden. When you mouse over the item for a description it reads, "It's bigger on the inside." I was very excited to see that, and made sure to buy a Tardis for my garden right away!