I am not going into how to make the fondant, you can find that how to here, and it is very good detail.
I add flavoring to it, just because I can.
Be warned, it is a sticky mess and you will wonder if you are sane.
Make a small cone. You can either tint your fondant or leave it white. Set aside.
I used leftover fonadant from the Lightning Mcqueen cake I made. (My first attempt at sculpting cake and fondant- never worked with it before)
This will show you how to make a rose bud, but I will explain how to do a full rose too.
Make another cone, and flatten it.
Keep flattening it, you want a thinner outside top edge, almost ruffle like.
I use my fingers, if it gets too sticky, put a dab of cornstarch on your fingers
Place the petal you just made on the cone. The petal should be just slightly higher than the cone itself.
Now wrap the petal around the cone.
Make another petal, place on your cone with the first petal's seam on the inside. Wrap.
Keep alternating sides, hiding the seam and adding petals until you like the shape of your rose bud.
Keep making the petals slightly larger, not overly large, and keep them thin.
I think the rose bud looke about right for my idea of a rose bud.
Tint some fondant green. Get out a very small leaf cookie cutter or a very sharp blade. (don't cut yourself, we aren't making a blood rose)
Cut your leaves. These are for the bottom of your bud, not the steam.
Attach to the bottom of the bud.
When attaching, I use a paint brush dipped in warm water and a touch syrup.
Put your bud on a bamboo skewer to dry.
To make a full rose, do step one and two.
Then you will be working in odd number petals.
the first petal is one
the second row of petals number three, when you put them on, overlap the petals.
Put your first one one, then the second petal will go on any where from the middle to out.
Your third row will be five petals, put on the same way.
Your fourth and final row (unless you want a really big open roase) is seven petals.
So for a rose bud, you work with one petal on placing the seam on the petal that is around the cone in the middle of the new petal.
With a full rose, you work in increasing odd numbers.
1, 3, 5, 7.