If an admin wants to build something helpful, they can get the spectrum color set, build it themselves on their own server, then load it up here.
I actually did that when I realized Tetris evented the water wrong and I couldn't change it because my trust with him hadn't registered. I wanded the water hoping to replace it before realizing I couldn't plant the water bricks afterwards. I saved the build, fixed it on my server, then loaded it back up.
There are some nice bonuses to this, namely that nobody gets in your way while you build, you don't interrupt gameplay, and it's a surprise when you load it back up. You also get to bypass trust checks when adding on to something else.