This 2x2 piston door is so Hipster, it doesn't need above ground redstone. I know that there have been people who have uploaded this in the past, but i decided to have my own crack at it, and this was the result.

I realize that the redstone is not very compact, but I am working on getting it smaller, and will continue to update the project as new MC updates (inevitably) break it. This currently works in both orientations in 1.5.1.

In the world save I have included three models, one where all the wiring is covered with a so-called hipster button as the input, and 2 others that have all the wiring exposed, in both orientations, to show it is not orientation dependent.

The wiring is 12 x 9 x 7, giving a total volume of 756 blocks, but it is difficult to explain how it works in words, so the only way for you to understand it better is to download the world save and try it yourself.

All diamonds, favorites and downloads are much appreciated.