you could do one of the barbie cakes (standing) but instead of the princess dress make a black cocktail dress or gown, dress it up with piping on the barbie as the top and add luster dust with some vodka to make it shimmer in silver on the edges or what not ( i have the picture in my head but it's harder to describe it! )
hope this helps!
I would do the classic stuff here, but in more adult color schemes.
You could do a small classic wedding cake with a real tiara on top.
You could do a pillow cake with the tiara on top, as others mentioned.
Or you could do either of those with a crystal shoe on top.
Use white, off white, pearl, silver, or gold and it will look very sophisticated.
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