so, I'll make the obvious suggestion --
a sheet cake cut and stacked, then carved to look like an arm in a cast
fondant strips layed on to look like the overlapping stuff they use to make the cast.
and of course the cast as been signed by friends and family --
fun idea -- leave cast unsigned -- take edible markers -- hide cake somewhere where the rest of family can go and sign it before presenting to grandma.
(and did you see the leg in a cast cake Duff did? if so..... this would have fingers instead of toes)
also good wishes here
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