how to take grungy/vintage-y looking photos?

[Steve P]

I will never understand why you WANT to take such awful, amateurish looking photos? There is nothing "grungy / vintage" about them. They are simply awful photographs taken with awful cameras by awful button pushers.

I agree with the above answer. Your Canon DSLR has decades of technology in it's design to do all it can to NOT take such photos as in your examples. Quit trying to dumb it down. Sell it if all you want is such terrible photos.

Just go out and buy any cheap, disposable camera hanging on a rack at a check out counter, one with a built in flash. Get the film developed at the cheapest place you can find, and get the cheapest, lousy quality scans available at time of processing.

steve