I agree with AnnieCahill - it is piped on.
From what I can make out in the picture - but can't be sure, is that it looks like a number 2 plain tip or bigger was used for this effect.
That looks like a lot of work! If you could get a cutter in the correct shape, you could always cut out the shapes and ice each one individually over a period of time and then attach them at the last minute? No less tedious in the long term but at least it would break up the work a bit and gurantee that the pattern is correct.
Would it not be with a rose petal tip in little ruffles?
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