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Would you make buttercream or gumpaste? How would you attach these flowers to the cake?

I can't get the link to work or I would try to help out.

cannot see what you are talking about

I would say gumpaste.

is this it?
http://i15.photobucket.com/albums/a389/lvcakes/Weddingcake.jpg
I would definately use gumpaste or fondant. I tried something similar with buttercream flowers and it was a pain. plus the fondant or gumpaste would look cleaner, I think.

I would make the flowers from gumpaste.

You could attach the flowers to the cake with royal icing.

i would just use royal to make the flowers and to attach them. that way you can eat them, unlike gumpaste