A screenshot of the first puzzle in the "Classic" set. Some Puzzling Pictures
A list of downloads for all image sets for SPP, arranged most to least recent (With the original one on top). A new one is released every week. Game download is available here, I recommend you give it a go if you haven't already
If you're looking to change the music that plays during the game, just go to the assets/music folder and add/remove mp3 files. Everything is completely modular