I was messing around with different piston door ideas and I made one that I decided to build a house around. But before I built the house I saved the piston door, with no housing or anything, here. This is just the piston door I made, which by the way is a 4x4, button activated door which requires a button to open when outside, and close when inside (or vice-verso. The button system is the only part that I've installed, you can change that if you want. Without the system and the ground this would be a bare bones map with uncovered redstone and it would look messy) It's a relatively fast door, and the redstone is really simple because this needs mods to work.
MODS NEEDED FOR THIS: MODLOADER, FORGE, MORE PISTONS, WIRELESS REDSTONE
(I used MAGIC LAUNCHER, if you do than that's the order in which they should be installed)
(I know PowerCraft has the wireless redstone feature plus alot more, and my door probably could have benefited from those features but it had a few conflicts with More Pistons and I didnt want to bother spending all day fixing them, so I just used Wireless Redstone)
I suggest either the R3DCRAFT or Soartex Fanver Texture Packs