I completely understand where your are coming from in regards to wanting a professional look for your phone. But I do like to have fun (colors) when I want. The following solved it for me. I am using LauncherPro (purchased), SettingsProfile (also purchased). This is how I set it up.
First I removed all the widgets from Touchwiz, then set LauncherPro as the main launcher. Then I setup some profiles using SettingsProfile with the below settings. I have rules setup so that when I am home my home profile is set, and when I am at work my work profile (which has a more "professional" look) is set.
For Work:
I have a very clean black and white background;
main LauncherPro icons black and white
lock screen set to pattern
volume patterns set to medium/low -being considerate I work in a team room environment
screen brightness set to 65%
For Home:
I have a different colorful background
main LauncherPro icons black and white
lock screen set to simple puzzle
volume patterns set to MAX - I want to hear the phone when cutting grass

screen brightness set to 95%