I think you already know about QuickSilver and how to change the hotkey. If you haven’t know, you can refer back to QuickSilver – Setting Up Your Most Favorite HotKey.
There are some interfaces of QuickSilver you can choose, such as Primer and Bezel. The Primer interface is built-in, so everyone will have this interface. The interface looks like this
Bezel interface is an additional interface. It looks like this
There are also nine buttons to select color for your interface and two check box. You can see where they are located at image above.
Each of these nine buttons specify :
|Primer Interface||Bezel Interface|
||Background Color||List Header Color|
||Shadow Color||Shadow Color|
||List Background Color||List Background Color|
|=||List Highlight Color||List Highlight Color|
||List Font Color||List Font Color|
That’s all for changing interface.