I wouldn't do it. It will taste badly (my opinion) I don't think the 2 should ever be mixed, or put on the same cake.
I don't have any pictures of my roses, but I think they are easier with the whipped stuff. I learned with it, so that is what I got used to.
I use a flower nail, put a blob of frosting on it, and then make my petals around it. I work with it slightly frozen (I always use the prewhipped stuff that is already mixed and comes in a bucket)
I would ssuggest putting it in the freezer for 20 minutes before making the roses.
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