I'm sorry you haven't gotten a response to your question. I've checked back a few times to see. I have never done this technique on ganache, so I really couldn't say. I've done it on buttercream with no problems though. Hope someone can help you soon.
Cris
I've never even thought of that before.
Ok, you have your design on paper, tape the paper to cardboard / cakeboard then tape a piece of wax paper over the top of that ( small pieces of tape , top & bottom ).
Then you pipe & brush your design onto the paper,same as if it was on the cake - leave to dry completely & then carefully ( after removing tape ) peel the PAPER away from underneath the piped design & attach it to your cake !
Hope that makes sense 
My daughter just did a completely ganach covered cake, she piped the vines directly on it but the leaves she made separately and let dry then attached. Here is link to a BC iced cake I made, with brushed embroidery floweres. I made them off the cake and attached at the reception
http://www.cakecentral.com/cake-photo_1077993.html
Jibbies
I'm goign to try it this weekend and post a pic of the results. Ok I couldn't wait. Here is what it looks like on what is left of a cake. I made one last night, and then a couple of friends came over today so I gave them some and had one slice left to try this.
Not bad, I think. It does gunk up the brush more than RI does but I think the effect is pretty good. I let the ganache set up on the cake for 12 hours so it had "hardened" enough that the brush didn't tear it at all!
Good to know for future!
Thanks for all of your advice!
Melanie
Quote by @%username% on %date%
%body%