Imagine if you combined Garry's mod with Minecraft, only better. This game will have an in-game editor, so you can make changes on the fly, and have your players see them immediately. Need some trees? Just open the editor, draw a quick texture, make a new block type, and voala: Trees. No need to send .mod files or restart the server, everyone already has your changes.
We edited all the textures to make it look more Namekian. We also added textures and blocks for trees. Collaborative real-time editing is fun!