Quite possibly the easiest DIY I've seen in a long time - wooden palletts/crates as a bed (base)! The first example, below, is nothing more than 2 crates, side by side with castors attached. And simply arranging the 2 pillows along the back of the bed gives the whole thing a bit of a daybed look. That "headboard" looks to be an old door on it's side (clever), the hinges at the top kind of give it away. Rather love the whole room.
The image below was styled by Real Living magazine's resident super-stylist, Jason Grant, although I'm uncertain as to whether he was responsible for the bed or not (anyone?). But isn't it a beauty? PS The "bedside table" is another DIY just gagging to happen!