This is my first project I'm uploading. It's 4 medium-large islands I made for a Steampunk project I'm planning on. The world save has no building/structures, just the islands over a water flatworld. The islands are made from naturally spawned plains, and just shaped by removing the negative space, so they include naturally occurring ores, etc.. It is currently in creative mode, but can easily be changed to survival mode using commands (/gamemode 0). Before changing to survival, you may want to spawn some other mobs as I believe the only naturally occuring ones are sheep. There are also no trees, so you may want to plant some. If you fall off the edge, you'll land safely in the water, and can just swim back up one of the waterfalls.

I may make a written tutorial on how I made it if requested. It required MCEdit.

The resource pack is a custom mashup I made for myself of several other resource packs.