I really know far less about Photoshop than I should, considering that I'm a graphic design major. For some reason we use Illustrator way more in our classes than Photoshop. To remedy my increasing sense that I really should be more familiar with this program than I am, I did what any 21st century student does... I went to YouTube.
This guy does an awesome video on how to create a textured, grungy poster look. Watch it if you like. It's pretty interesting.
Anyway, since learning doesn't do a lot of good if you don't apply it, I decided to play around with this technique on my own!
I started with this photo:
Here's what I came up with! Pretty neat, huh? I'll definitely have to keep playing with PS to get as comfortable with it as I am with Illustrator, but I'm starting to wrap my head around it's capabilities, and that's half the battle, right?