I haven't tried it but I'm sure you can do leaves and some people say they've used it for roses.
I don't know how dark you want to color it but I just used it on a watermelon cake and got both a bright green and a red/pink with no problem - I used Americolor.
I guess the only thing I can do is make up a batch and pipe some and see what happens. I will try to pipe the roses around a hershey kiss.... I saw a recipe for IMBC that also adds in some shortening and they said it was more stable so I may give it a shot. I have used ShirleyW's and it is delicious.
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