Force usergroups to post in a different font color by default

[SiK GambleR]

For one, I'm wondering if this is possible?

Two, where would I place code for something like this?

Three, can someone help me make/find a code that would work for this.

An example would be something like the staff on Blizzard forums; they post in blue for every post, indicating that they are the staff. I want to do something to that effect.