You mean like a crown? Or do you mean a cornet, which is like a trumpet?
The musical instrument. when I was first approached about it they said Jazz. Now to me when I think of Jazz I think of the saxophone so I had planned it all out to look really neat and then they said Coronet!!! I didn't even know what it was so I had to look it up to see what the instrument looked like. I have a friend who could help me make a stand or support, I just don't know how to go about it.
A cornet (no O in the middle) is very much like a trumpet. I found nothing for cornet cake on google, but when I googled trumpet cake, I found this:
http://www.flickr.com/photos/terrablu/2432822015/
Here on CC, I found this:
http://www.cakecentral.com/modules.php?name=gallery&file=displayimage&pid=1197603
and this:
http://www.cakecentral.com/modules.php?name=gallery&file=displayimage&pid=1222803
I have no idea how to help you further, but I wish you GOOD LUCK! 
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