They look like frangipani....scroll through the list that Rylan gathered for a tutorial on them...
http://cakecentral.com/cake-decorating-ftopict-654803.html
There is a tutorial on YouTube on making those flowers. They are pretty easy to make once you get the knack of rolling them to look like a spiral.
When searching on YouTube for the tutorials they are also called plumerias. I have a cake in my pics that has these flowers - sorry, I don't know how to post a link.
I love plumerias. They remind me of HI because they are so abundant there. They must be easy to make because there were plenty of fake ones to buy too.
I would definitely look for plumerias when researching this.
Beautiful cake too.
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