A four-poster bed for two.

You need:
2 bookshelves
2 oak steps
2 oak stairs
2 oak boards
2 beds
12 Fences
6 blocks red wool
8 blocks white wool

Instructions:

First you dig a 2x2 block hole in the wall as shown in the picture.

In front of it you put two blocks of wool and two beds, next to them oak blocks and oak stairs.

In the hole put two steps at the bottom and two bookshelves at the top. Next to the bed you build fences

Then you build a roof out of wool, and the four-poster bed is ready...