Actually guys if you want the exact color and are tired with playing with those codes use this website table.. instead of putting in hex or decimal codes leave it check for decimal and hten put in the "access" code from the last column... works PERFECTLY.. attached is purple/silver combo.. use a dif color access code for up/down...
http://cloford.com/resources/colours/namedcol.htm
Edit for task manager is..
HKCU\Software\HTC\TaskManager.... same other keys
Start Menu
HKLM\Software\HTC\EnlargeMenu
Also you can edit the background by changing the file Pattern_2_2.png in the windows folder...OR point to antoher file. Custome Texture is the key in those reg edits