Check out this CC tutorial on frozen buttercream transfers. The technique for chocolate is the same - just use colored white chocolate or candy melts instead of buttercream.
http://www.cakecentral.com/article12-How-To-Create-a-Frozen-Buttercream-Transfer.html
Hello! I just did a Winnie the Pooh baby shower for my neice....also using chocolate transfers! Lots of fun! http://cakecentral.com/modules.php?name=gallery&file=displayimage&pid=1386952
I just sent you a PM with a document I made up after I people asked me about chocolate transfers on cookies last year. It's older and doesn't include recent pictures of some I've done, so if you have any more questions, don't hesitate to ask.
The frozen buttercream transfer link ibmoser provided above is where I started - it is very helpful. There was another I used from the web, but can't find it. I DID find another one one though...and it has Winnie the Pooh as an example! http://www.ehow.com/how_2330852_transfer-picture-using-chocolate.html
Good luck and have fun!
Pat
I LUV choc. transfers! The computer gives you endless graphics to work with. My customers love love them!!!
Jennifer 
Thanks so much Michele! That's so nice of you to say.
Chocolate transfers are a favorite of mine because I can't draw very well but I CAN trace!!
I also like that they can be made ahead to save time on the day I need them. Plus I always make extras for breakage, so I have an assortment of little chocolate things for quick last minute cupcakes.
Thanks for the question and the responses. I did a FBCT once and it turned out ok. This method sounds much easier and it is with choc. Can't wait to try this out this week on my son's birthday cake. I steer away from sheet cakes as I can't draw...no really not at all. Anyhow this may be my best friend in cake decorating. 
Thanks
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