Last year--July-August of 2012 (yes, I am that far behind)--my husband built this set of bunk beds for our kids. We were expecting our fourth child and needed to do some room sharing. This spot was a great spot in the room, but it was just not quite wide enough to put pre-made bunk beds in the space. So he built them in place. Those things are never moving.
He did some other cool stuff for them. He wired in a light with each bed so they can read at night. He also added shelves at the head of the bed.
Each bed also has a "treasure box." Under the bottom shelf, you can pull down the opening and fit a whole lot of treasures inside. Our kids love it!