Do you think this is just piped row by row? Looks tedius if it is.
teal rounds.pptx 67k .pptx file
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.