I did – I first covered the top tier (it was a small, 6" round cake) in brown fondant, then used thick brown scrapbooking paper to form each side of the “box”. I taped it together on the inside (making my top flap folds before placing on the cake) then slipped it over the top. Hope this helps!
Becky, North Carolina, http://www.cakesbybecky.blogspot.com