Two suggestions..
#1 - You should be able to make green/blue/yellow (Like how you can color words, you should be able to color titles the same color) titles at same price (5 fg)
#2 - You should be able to bold PM's or color them (The title of the PM) but also at the same price of 5 fg
The list of colors you should be able to choose from should be this
Blue
Red
Purple
Orange
Yellow
Gray
Green
Black
White
Gold
Silver
It wouldn't be hard to do so imo it would be a good idea and colorful =)