I am sick of Longhorn Aero esques all around too. But I can promise you this one is a bit different. FOR TOP SHELL, GET IT FROM SAHTEL'S THEME [link] IF YOU ARE IN RTM.
IF YOU ARE RUNNING SP1, GET IT FROM YETHZART [link]
Diamond was a XP theme based in Longhorn created by Lucifiar/Windows X [link]
and included in a LH Transformation Pack. I guess it was the first I have ever used, I even had troubles with uxtheme.dll back then. It was one of my favorite themes.
After I released Reanimaero, I start playing with the Basic theming and ported some parts of Diamond to Reanimaero... the thing started growing interesting, Mheltin tested and liked and I thought I could make it public. So here it is, a tribute to that awesome theme.
More details in the readme included.
Thanks to Lucifiar/Windows X for granting me permission of releasing this theme with Diamond parts.