Experimenting with expired Polaroid film

When I purchased a 600 Polaroid camera it came with a set of expired but unused film, I thought that this would be something interesting to play with. 

My first shot didn't come out what so ever and I thought that that would be how the rest turned out however they did not, and it actually created some really interesting effects. Each photo came out slightly different and with a sepia tone, with stripes down the middle. 

I found these really interesting and they look distressed, I have now bought in date Polaroid film so that I can shoot my photos with that to see how it comes out.