The great thing about LEGO bricks is that they can be used to build lots of different things from the same parts. Take this as an example: Martin Latta used the pieces from a 7685 Dozer kit to build a Star Wars pod racer.
Here’s a unique mod: a bulldozer! This one’s got it all, and by “all,” I mean colorful lights and moving parts. You can paint a case all day long and glue on all the setpieces you’d like, but movable parts beat all.