This looks pretty sweet in my opinion and was well worth the $25 for the "kit" and the 15 minutes it took to install.

--15 mins of your time
--small (short) phillips head screw-driver
--10mm socket

3rd Brake Light Cover Mod Kit (from cc-b.com)
http://www.tattoofever.com/images/wrx/3rdBLmod/3rdmod00.jpg

disconnect blue/white connector & remove bolts (10mm)
http://www.tattoofever.com/images/wrx/3rdBLmod/3rdmod01.jpg

brake lights before
http://www.tattoofever.com/images/wrx/3rdBLmod/3rdmod02.jpg

http://www.tattoofever.com/images/wrx/3rdBLmod/3rdmod03.jpg

3rd brake light assembly lifts out easily
http://www.tattoofever.com/images/wrx/3rdBLmod/3rdmod04.jpg

screw clips slide back easily and fit snug
http://www.tattoofever.com/images/wrx/3rdBLmod/3rdmod05.jpg

http://www.tattoofever.com/images/wrx/3rdBLmod/3rdmod06.jpg

line up the brake light cover and screw it down
http://www.tattoofever.com/images/wrx/3rdBLmod/3rdmod07.jpg

brake lights after
http://www.tattoofever.com/images/wrx/3rdBLmod/3rdmod08.jpg

http://www.tattoofever.com/images/wrx/3rdBLmod/3rdmod09.jpg

spare parts :-)
http://www.tattoofever.com/images/wrx/3rdBLmod/3rdmod10.jpg