We no longer have a dedicated creative world. Creative Mode and other builder utilities are now offered to those demonstrating talent, especially those working on large projects in Wolfia. If you are interested, talk to Galvin (lead architect of the server) in-game.
The old creative worlds have been removed, though selected builds may be moved to a museum area, or a future creative world. There are world downloads available for most of our previous creative worlds, if you are having trouble finding any, please ask Kyle.