Bukkit

Maybe you could incorporate this two outdated plugins to Living Building

http://dev.bukkit.org/server-mods/paintingswitch/
http://dev.bukkit.org/server-mods/half-slab-utilities/

?

maybe there aren't exactly similar to Living Building but definitely are very good, deserve to be update and fit your slogan :)

Building Better Worlds,
In a Nutshell, this plugin will allow a user to place block in places that were never allowed, allowing for more creativity form users.
Living Building - Extend You Creative Limits