I learned how to make them out of gumpaste in a class a couple of weeks ago. They were a serious pain in the butt, I thought. Mine didn't turn out so great, but the other people had nice ones.
We had hibiscus cutters that we used (we just borrowed them, and I don't remember the brand, sorry). The pain part was getting all the little stamens in the staminal column (I looked that up!). The column is gumpaste on a wire, with the bottom and top more bulbous than the middle. The pollen is a mixture - I think it was yellow luster dust and powdered gelatin? The petals are individually wired, and then put together on the column wire. They're bent in sort of an S shape.
The cool trick we learned was to use thread to get them all on there. Wrap a piece of thread around the column wire a couple of times, then add a petal and wrap a couple more times. Do that for each petal, then finish up with floral tape when they're all on there. Using the thread eliminates all the bulk that you would get wrapping them each with tape. 
Good luck!
I learned how to make them out of gumpaste in a class a couple of weeks ago. They were a serious pain in the butt, I thought. Mine didn't turn out so great, but the other people had nice ones.
We had hibiscus cutters that we used (we just borrowed them, and I don't remember the brand, sorry). The pain part was getting all the little stamens in the staminal column (I looked that up!). The column is gumpaste on a wire, with the bottom and top more bulbous than the middle. The pollen is a mixture - I think it was yellow luster dust and powdered gelatin? The petals are individually wired, and then put together on the column wire. They're bent in sort of an S shape.
The cool trick we learned was to use thread to get them all on there. Wrap a piece of thread around the column wire a couple of times, then add a petal and wrap a couple more times. Do that for each petal, then finish up with floral tape when they're all on there. Using the thread eliminates all the bulk that you would get wrapping them each with tape.
Good luck!
This link has instructions on how to make hibiscus in buttercream or royal icing.
http://www.cakecentral.com/cake-decorating-ftopict-38091-hibiscus.html
I did this one. It is a different take on it, a FBCT
http://www.cakecentral.com/modules.php?name=gallery&file=displayimage&pid=53920
Well the pic in my avatar currently is my attempt at a hibiscus Was close enough that most people I showed it to knew what it was! I did the same as the royal icing instructions someone else posted in those other threads did - well mostly 
I used my largest lily nail (that came with my course 3 kit) and tip 104 - though I would have liked a slightly bigger tip to make it a bigger petal easier. Then I coated a wire with the yellow and added the red dots. Just took awhile to dry!
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