how to take grungy/vintage-y looking photos?

[tennis_tacos]

So I've been trying forever to figure out how people take those grungy looking photos as if the photo was taken with flash but it's more muted, the colors are faded, and the entire photo often looks kind of hazy/blue-ish? I figure it can't just be film photography, because the fad seems too common. Is it a specific type of camera (disposable/digital/point and shoot?), or setting on a camera?
I personally own Canon Rebel DSLR and have never been able to manipulate it to take photos that look like the following. Any help would be appreciated! Thanks.

Here are just some examples I found on tumblr of the *effect* I'm talking about:
http://24.media.tumblr.com/tumblr_mdyixp...o1_500.jpg
http://24.media.tumblr.com/tumblr_maphrp...o1_500.jpg
http://25.media.tumblr.com/tumblr_mdykub...o1_500.jpg