System preferences > General > Appearance > [Blue|Graphite]
Graphite will turn menu selection co
lor to dark grey. Of course it's system wide so it also will change the color for other UI elements.
You will need :
Download SArtFileTool into ~/Downloads/SArtFile then copy and decompress the system art resource file :
cp /System/Library/PrivateFrameworks/CoreUI.framework/Resources/SArtFile.bin ./
./sartfiletool -d SArtFile.bin artfiles
Go into the artfiles directory and find 52.png 68.png 71.png files and modify them.
- 52.png = "Blue" top menu text selection color
- 68.png = "Blue" menu item text selection color
- 71.png = "Blue" help menu item "Search" background color
Then recreate SArtFile.bin and put into place :
./sartfiletool -e artfiles SArtFile.bin SArtFile.new.bin
sudo cp SArtFile.new.bin /System/Library/PrivateFrameworks/CoreUI.framework/Resources/SArtFile.bin
Logout & log in again, menu should look something like this (I cheated and used the turquoise-ish files from "Lion Pulse" mod.)
The SArtFile is poorly documented for Lion, here's the explanation of the contents for Snow Leopard but Lion's is different.
The selection in Finder is still the harsher blue, haven't looked into that yet.