UPDATE (Sept 5/2013): I’ve updated these wallpapers! Now in glorious .PNG format, with new tablet and smartphone sizes, and one less typo than before*, oops. You can find a bunch of different sizes for different devices after the jump.
Click to enlarge, then save to your computer/device.
For PC:
For Smartphones:
For Tablets:
*For the last 2.5 years one square read: CABINS A place to rent that is made of logs, when it should be rest. I misread the source image.
It’s a very nice .PNG format, you could easily make your own poster if you want. But if you try to sell this on Etsy I will cut you.
Speaking of posters:
You can grab this baby and hang it in your office. Click the image or here for more information.
I also made this Charles Mulligan’s poster too. The only large high-res poster available. Click here to grab one.
If you’re looking for another cool printable I have a Mouse Rat CD cover here.
Dave's Geeky Ideas 
There is a small difference in captions - some of the sub-texts are not italicized. Is that by design? In the Parks and Recreation wikia all sub-captions are italic.
I want to make this into a poster for my husband for Christmas. What would be the best way to go about that? Which file size and do I need to do any kind of conversions? What poster size would be best for the graphics so it doesn’t get too fuzzy? I don’t know what I’m doing. lol
These aren’t ideal for posters, you need a high-res image that is 300dpi to look good. That said, a Kinko’s or UPS Store could print one. Also check out sign makers in your area, they can make something.
Would these work for 5×7 cards? I wanted to make one for my friend but the text looks blurry for the pc ones.
No, shrinking the image down would make all that text blurry (the header image of this post is roughly 5×7, doesn’t look good at a glance). This was conceived to be a poster, doesn’t work as a postcard.
Oh that makes sense. Thanks so much for your help!