For a modern take a on the traditional canopy bed, try bed curtains. Instead of being mounted on a canopy bed, these curtains look great hung from the ceiling. You can use a combination of standard curtain rods mounted on the ceiling to create this
The next best thing to sleeping among the trees is a bedroom turned into a forest. I love (and covet) the "Apple Tree Canopy Bed," above, by Attiladesign in Finland -- as well as the magical two beds below: "Tree.