This is a pixmap Metacity theme based off the Luna graphics on Windows XP. I made it out of boredom one day. I also couldn't find any other good Luna themes for Metacity... most of them were lame ones based off Clearlooks and were only Luna-style in the fact that the X button was red and everything else blue.
So, I created the blue one first, then the silver one, then decided to make a pink one based off the silver (there aren't enough pink Metacity themes around here).
To those of you who couldn't find the start button (because you couldn't just search this site for "start button" and find it), I got it from here:
The GTK+ theme in the screenshot is a modified Linsta3.
Update: added mirror links for all the files, just in case my server goes down like it did for a few hours this afternoon. :)
Update (Version 0.02):
I decided to rename the theme Lunacity (a combination of Luna and Metacity, since Luna themes do exist for other window managers, and because I don't plan on making a GTK+ theme, this name fits it better).
I've added the olive green theme, making this a complete Luna set (plus pink). Also, maximized windows lose their curved edges and borders now, like they should.
NOTE: All four themes are included in the one tar.gz file, so extract it and then install the particular themes that you want via their tar.gz files within.