I've seen some very pretty cupcakes which apparently have been piped with the 2d tip, or the 127d tip. Now that I have those tips, I'm not sure what to do with them!

For example, the first photo on this link is of cupcakes, that piping is lovely:
http://www.customcakedesigns.co.nz/photo_gallery.asp?section=1226&pageID=2145884259#

Does anyone know how to do it? I have found a few things on youtube, but none seem to relate to my tips, more to making flowers.

I did e-mail the lady who made those cupcakes, and she told me: "The rose effect piping is created using petal piping nozzle start from the middle and work out"

But I'm really not sure what to do with that info..... has anyone seen any videos on it perhaps?