I've made them out of royal icing before. There's a pic in my gallery. I think it's the very last pic on the second page...baptism cake for a woman. I made a bunch of small, four petal flowers with royal and let dry. I used different shades of pinks and greens keeping the colors soft. Then I put them on a half round styrofoam covered with buttercream (wax paper on the bottom so it didn't touch the cake). For the smaller mounds i used buttercream. Pretty simple to do. If you like bigger hydrangea's, make bigger four petal flowers!
Hope this helps!
elly
Thankyou Mylene. No actually I haven't done them in fondant or sugar paste but it could easily be done. You'd do it in the same manner as the royal as far as making them individual and them mounding them together. I LOVE hydrangea's and have several of them in my back yard. They'll be blooming away very soon!!! They flow from pink to violet to blue! Great inspiration for a cake!!!!! Hope you get a chance to try making them!!
elly 
You can make them out of gumpaste pretty easily... I got a cutter from Scott Clark Wooley... The cutter is one blossom and you just have to make a small ball for then center and then attach it to the flower...
Here's a link to the cutters for the flowers and the leaves...He also has silicone veiners as well... http://www.cakesbydesign.cc/MetalCuttersDtoI.html
Here's a cake with some hydrangeas I made using his cutters and veiners... [/url]
I'm making them right now for a June 9th cake. I'm using Nicholas Lodge's recipe for sugarpaste and using a small five-petal cutter (four petal cutters are more expensive and hard to find) and then I am folding one petal back into the center to make it a little thicker and using that to 'pull' out a calyx.
They usually come in ball-shapes - and that is what the bride wants this time - so I will need to make a large number for the topper and the bottom layer.
One thing I learned - make tiny-tiny center balls beforehand and when the rest of your flower is formed, dip a toothpick in water (just the tip) and twist a tiny hole in the center of your flower - then use the toothpick tip to pick up a tiny ball - it should stick and use that to put the ball in the center hole. You can get some nice tiny centers that way.
In my research - I've found that sometimes the centers are the same color as the flower - and sometimes they are different colors - or white.
Also, some buds go nicely.
Fondant, for me just doesn't make the petals as delicate. But, I've see some really nice, thicker, fondant flowers that have that 'retro' look so many of the young women are after.
Both are edible - but I don't think I'd eat either one. lol The sugarpaste dries pretty quickly, but once you have your techinque perfected - it goes pretty fast.
If you're using fondant - I've heard advice to use either shortening - or cornstarch on your hands and board to roll it out. Just a teeny bit, I would assume.
You might want to try both - and use the medium that works best for you. Both are pretty inexpensive - but you will need Tylose for the sugarpaste (if you use Nicholas Lodge's recipe). It's my favorite - but there are a few out there that other's prefer.
How soon do you need to have the flowers done?
just had to say that your flowers look very nice Tami! 
If you want to pipe the flowers, someone on another forum said that they use a mound of frosting or a mini egg or ball for the base of the hydrangea cluster and then cover it with tip 190 five-point drop flowers. They use the large petal tip 127 for the ruffly leaves and tip 7 for the stems. The idea came from the 1993 Wilton yearbook. I don't have this yearbook or I would show you the picture, but I would think this would turn out very pretty with a spatula striped (or two colors swirled) bag.
Also, I wanted to mention that the hydrangeas that grow in my yard and the one's in my area are all five-petal flower clusters. Some have petals with jagged edges and some have smooth edges. I've been paying close attention lately because I want to do a hydrangea cake myself.
So...you could use an inexpensive 5-petal cutter with fondant or gumpaste, a 5-petal drop flower tip, or make 5-petal flowers on a nail and attach.
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