I am planning to make Mickey Mouse ears out of Rice Krispie treats and let them dry for a few days. I figure they are very light and once dry, stiff as a board. 
make the motorboard out of gumpaste, no need to use cardboard
Man, wish had the tip about using gumpaste for the mortarboard a week ago! I just finished a book cake with a grad cap on it and used cardboard covered with fondant. It worked, but the mortarboard would've been better looking with the gumpaste since it would have sharper lines and hold up better on the corners.....not to mention alot easier and quicker! Thanks!
Debi
and should any of those fail,or you run out of time get black foam core and cut it out of that. no need to cover it and its light weight.
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