I've always just used gumpaste or a gumpaste/fondant mix. I guess you could try it. If you want the flowers to stay flat (like you will just glue them flat to the cake) it would probably work. But if you want them to hold their shape and stay up...you will probably need tylose/fondant, gumpaste, or gumpaste/fondant. Good luck!
I was just making some coral-type stuff today and I used regular boxed fondant and some leftover MMF that I had on hand. It's hours later and the pieces made from the boxed stuff are really hard, whereas the ones made from MMF are still a bit bendy and soft. I don't know that they'll harden very much more, but I'll give them a chance. Long story short -- it seems that MMF doesn't always work too well for something that needs to 'stand' on its own!
Sarah
I use a mixture of 50/50 MMF/gumpaste (both homemade) for all my figures and they harden up fairly fast depending on the size. Here is the last thing I made with this mixture.
http://www.cakecentral.com/modules.php?name=gallery&file=displayimage&pid=1332363
They dried in about 3 days.
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