While working on a feature film called The Grind, filmmaker Vashi Nedomansky had to come up with a way to shoot a flashback scene, complete with Humvee, in the desert of Iraq. The only problem? He had neither Iraq, nor a Humvee to work with.
Fortunately, he did have the sand dunes outside of Los Angeles and a 1:18 scale model of a Humvee purchased at Walmart for $23. Combine those things with a bit of creativity and you get some low-budget, professional-looking visual effects.