Bookshelf, bookshelf, on the wall...
My room actually has two doors. One out onto the corridor, and the other to connect it to the room next door. Since we didn't need the connecting door, we put a big cabinet in the other room that covers up the door. On my side, all you see is the doorframe and a big piece of fibreboard. Since there was a recess in my room, we pretty quickly decided on building a chipboard bookshelf into it. Originally, we just spaced the boards evenly, but after a while I realized that it was too shallow for anything else than CDs, DVDs and VHS tapes.
So, quite a while ago, my dad fetched three additional chipboards so I could put in more boards and pull some of the boards closer together (since CDs are about half as tall as VHS tapes or DVD boxes). Today, I finally got around to pulling out the old boards and putting in the new ones. It's a very simple bookshelf. Two boards along the sides of the doors, and then wooden blocks nailed to them on which the actual shelf boards rest.
One thing to watch out for is to not just hammer the nail through the small wooden blocks, but rather to use a small drill to get two holes into them. Otherwise the small blocks may just split in half.
It's not by any means a complicated feat to make such a simple bookshelf, but it was fun to do something like that again. Especially since this means that the stacks of VHS tapes and DVDs I had on the floor are now again neatly arranged in a shelf. Did anything fun like that recently? Why not blog about it and let me know? I'd be interested in what neat things others do.