Personally, I LUV these Operation cakes. You could tailor it to a chiropractor by doing the backside and labelling the spine:
http://cakecentral.com/modules.php?name=gallery&file=displayimage&pid=1772680
Or you could incoporate this image into the cake:
http://www.choosewellnessliving.com/wp-content/uploads/2009/10/chiropractic-logo2.gif
Here are a couple of other ideas;
http://cakecentral.com/modules.php?name=gallery&file=displayimage&pid=1366821
http://cakecentral.com/modules.php?name=gallery&file=displayimage&pid=1460077
Please post pics after!
To make it simple, you could carve the cake into the basic spine shape (sort of wavy and rectangular) and make the bone out of fondant and lay on top. Hope that makes sense! Eg: do one of the spines like in this cake photo, make it bigger and shape the cake around it:
http://cakecentral.com/cake-photo-1614572.html
The first thing that popped into my mind when I read your thread title was she definitely needs a topsy turvy crooked cake!! And I was envisioning a gumpaste made spine snaking up the front with flesh covered fondant covering the cake. (which could be apricot or peach or light cocoa, etc.)
Even if you only did two tiers, you could still hightlight a crooked spine. The top could have your congratulations message.
Wish she would let you fashion the spine ONTO a cake instead of carving one! Won't that really cut down on the servings if you have to carve just a spine? (I like the idea above this post about how to carve the cake in a loose translation of a spine and make one to lay on top)
You could do something similar to the skeleton pirate in my photos, but laying down. Just a cake carved with the curve in it, covered in black, with the spine, ribs, etc., laid on top of it. Let me see if I can find a picture of the back...
Okay, it won't let me upload the back view for some reason so you'll have to use your imagination!
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