Adding color highlights to a B&W photo

Hi - I need some design advice / inspiration. I have an intermediate knowledge of photoshop...just limited talent! (I can do layers, do masking, and some other stuff)

I have a 70-yr old B&W photo of my Mom from when she was just 3 or 4. For a 4x6 party invitation I would like to add some subtle Tiffany-blue turquoise highlights to the picture. (maybe make the bow Tiffany blue, part of the dress, a border....this is where I need the inspiration).

Any techniques or ideas I could use to layer in this subtle blue hint would be much appreciated!

Thanks...Larry

oh, p.s., if you want to see the actual photo I have it on my web site at http://www.tak5.com/mom.tif

Here are some good tutorials for colorizing:

http://www.worth1000.com/tutorial.asp?sid=161015
http://www.worth1000.com/tutorial.asp?sid=161018

masking opens a world or possibilities for me. I guess I wasn't an intermediate pshop user