Basic circular tower layouts for building round towers in Minecraft
6 unique wall designs in Minecraft - Más
Minecraft Underwater Building PC Guide -I reckon I could still do this on my iPad.
This is a large castle, and is a nice, very late-game house. The grey represents what material you want to make it out of and (not including floors) is approx. 40 stacks of material for an 10 block high, one floor castle.
They are minecraft mad at the moment.
The road tile set overview