Are you wanting to pipe them or cut them out of gumpaste or fondant?
This was my first try at making gerberas (and my first fondant covered cake). I used the large PME sunflower cutter. First, I rolled my gumpaste very thin and, holding the cutter face up in my left hand, I draped the gumpaste over it. I rubbed my small Wilton rolling pin back and forth over the cutter until the flower was completely cut out and I could easily remove the surrounding waste. Then I pressed the cutter down on my mat to create the impression. Ejecting the flower is tricky, sometimes I had to kind of pull it out of the cutter. I cut two flowers and stacked them together so that the petals were alternating. I used some homemade gumpaste glue to attach them. I cut the centers using a small circle cutter. I probably should have made them from smashed balls. Oh well...next time. 
Once the flowers were assembled on the cake, I rolled little pieces of tissue and tucked them between the top and bottom petals to hold them up while they dried, except that the gumpaste I bought doesn't dry!
. . . tutorial for gerber daisy
. . . http://cakedecorating-stuff.blogspot.com/2008/07/gerbera-step-by-step-tutorial.html
. . . http://cakecentral.com/cake-decorating-ftopicp-6006315-.html#6006315
Thanks dragonflydreams! While the cake I used as inspiration was very simplistic in its design, I knew I would want to make more realistic gerberas one day and the first tutorial you posted, with the fuzzy centers, was exactly what I needed.
Awesome!
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