Here are some innovative loft beds I've came across:
This loft bed would be great in a small space. The pull-out desk and the trundle bed are unique features.
The step side feature and themed designs of the below two beds are very unique and creative.
This modern style would be great for a "tween" bedroom.
I really like the stairs on the below loft bed as opposed to a ladder. This would be safer for younger siblings who want to climb into older brother's or sister's bed.
Can you imagine being able to get out of bed using a slide? That would have been AWESOME when I was a child (hey, that would be awesome now as an adult!).
This is a great idea for a teenager's room where space is limited... a daybed below with lofted couch-style seating above:
The pull out drawers integrated into the stairs in the below loft allows for creative additional storage:
The idea of a rock-climbing wall is a good idea for a bedroom that doubles as a playroom:
http://www.sweetdreambed.com/ also has some absolutely amazing custom loft beds.... from castle beds to cottage beds to tree house beds, and many more. Check out their site!