Photographer, Lissy Elle, has done some really nice work in capturing the whimsy of childhood imagination and other fantasies in her "Let's Play Pretend" photo set. While she does explore dark themes too, it's the imaginary play ones that are memorable for me. Here are my favorites.
There are many more on Trendhunter, where she's currently being profiled for her fairy tale-like work.
She also has a Flickr account HERE, with even more dreamlike images.Takes me back... :)
Note: Not all her pictures are sweet daydreams. She explores darker themes too.