Could you not add one of them to your base bow (Make a twisted bow on bottom and just overlay the 7/8 inch ribbon) FUSE THEM TOGETHER with fabri tac or something??
Then use the other on top by making one of those two loop bows. I can't think of what it's called. Let me try and find the link.
Maybe this?? http://www.youtube.com/watch?v=aeYUjVAgz2M
Add some spikes in between? *IF you have enough ribbon , that is.