This is a variation of my son's birthday cake for a little boy who came to his party and fell in love with his cake. Instead of a big dumptruck, I did a bulldozer on built up hill. The road is crushed oreos and graham crackers. The "hole" is a plastic bowl set into the cake and filled with "dirt" and gummy worms. The bulldozer looks like it has dirt in it, but it's oreos packed on top of icing so that it stays put.