Hello! I am new to CC. Quick questions: I am attempting Cornelli Lace for a cake, and would like to know if it is hard to get it to stay on the side of the cake. (any good techniques?) Also, I want to do Chocolate lace on a white buttercream icing. Do you use Chocolate Buttercream for the lace as well? The chocolate lace looks dark...just checking if you color it up using lots of brown food coloring or what! Any help would be greatly appreciated! 
It sounds like you know exactly what you're doing!!! 
Yes, it will stick very easily to the side of the cake and, yes, you can use chocolate buttercream. Finally, yes again, you can add brown to get the buttercream to the shade you want -- just remember that it darkens with time, so better to add too little than too much.
See, you didn't even need help, just reassurance! Post photos, please.
Not sure how experienced you are with doing Cornelli lace, but if you want to do the kind that doesn't cross over, practice with pencil and paper. I taught quilting and that is how my students learned before sitting down to sewing machine.
Also, if you want your chocolate buttercream lighter, use less cocoa to start, and gradually add more to get it darker, remembering that it gets darker with time. May have to start with a little less liquid and add more drip by drip to get to right consistency.
Don't forget the piping gel or corn syrup.
PS I LOVE CORNELLI lace!
Piping gel or corn syrup will give the buttercream elasticity so that your lines don't break while piping
i think it gives elasticity to the icing so as not to break easily. Don't forget to get all of the air bubbles out of your icing bag, breaks in the lace are such a pain!! Good luck!
everyone have a great Holiday!!
And one thing that alllllllllllways helped me, is I put the cake on a turntable, and prop a corner up ever so slightly, so the cake is at angle. Otherwise, when you pipe all those little squiggles, they don't pull away from the cake and fall in lines.
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