Appows Windows 8 Visual Style also works on Windows 8.1.
You can use it with any of this icon packs Windows 8 Icon Packs.
Visit this link to know How To Setup Windows 8 Visual Style.
Some special instructions for Windows 8.1 users, there is an included registry hack to modify the caption text to blank. Make sure to use it.
If you wanna have full transparency with this theme, you can use either of Have Full Windows Transparent With Glass2k or Full Glass Tool To Simple Windows Explorer Transparency.