Drive (or better, WALK) to an area with alot of colonials. Take pictures of looks you love AND looks you hate. Print. Show them to everyone. Write reactions down on the photo.
Flip through some magazines.
Image Google "Brick colonial" and "shutters". Look.
I am not that creative about color. But I am more than willing to steal someone else's inspiration. Right now I am trying to pick shutter dogs.
FYI: some of the older colonials in my area (+150 years) are removing the shutters and leaving them off. It draws attention to the brick work. Me, I'm keeping mine on my whitewashed brick Federal (they are so dark green they look black in pics).
If I could only remember to THINK about what I was doing before I did it.