I like to build microscale vehicles. They look neat and can be a fun addition to your MFZ table as scenery or terrain. Unfortunately, most of the things I've built are not in the standard scale for MFZ.
There are some other neat creations out there.
Micro Truck by oLaF-LM.
Got Tonka? by monsterbrick.
Cargo Series by Galaktek.
There are some nice Minifig Statue scale vehicles in this picture. We even get some nice scenery.
My latest microscale vehicle, on ipernity.