Depends on what you're going for. I've seen some MPG aero mods that could be done with time and found materials.
Befriending someone who owns a graphic shop and could give you some mistake vinyl would also be cool and free!
Select as Best AnswerUndo Best Answer
Destroying it, Mythbusters style!
Let's see... -Dropped out of helicopter -Dropped from crane -Blown up with gasoline and detacord -Cut in half with thermite -Putting stuff into the fuel tank to increase mileage -Crunched with supersonic rocket sled (My favorite) -Driven through a multitude if things (Fruit stand, fence, trailer) -Cutting the drive-shaft to pole vault it -Attaching 4 rocket engines to the back I cant think of anything better to do with a car!
Repaint your car (a few tutorials to cover how to do this), Hood lights, Underglow, make/buy Exhaust Tip, LEDs in the interior, and perhaps make a cheap mesh grille.
Replace your air filter if it is dirty, change your oil, replace fuel filter, replace spark plug wires with performance ones, replace brake pads/shoes, octane booster, replace spark plugs, and replace your muffler.
Those are the cheapest things I can think of to modify your car for less than $200 per mod. Also, don't use junk oil and lubricants.
Is it currently running? I think having a running car is cool, especially if you say you got it that way yourself.
Paint. Newspaper, masking tape, skill, and a rattle can are all you really need to customize the skin. You can pinstripe, or at least try. Mineral spirits wipes off mistakes from a clearcoated vehicle.
AB foam and spray paint