When I saw a bag similar to the one below on the 'net, I knew I wanted to make one myself. I've read the tutorial a few times, but when the time came to do my own bag, I couldn't find it any more, so I made sort of my own thing.
For a while now I asked friends not to throw away the wrapping of the Ritter Sport chocolate bars, but instead give them to me. Over time I got quite a good number together.
After cleaning them (there's always a bit of chocolate sticking to the inside - yucky) I pressed them flat in an old atlas I don't use anymore. After a couple of days they are nice and flat and I could fold them to the size I wanted (though, I think, if I know the size in advanced, I also could fold them before pressing)
I then sewn the bag together and lined it with black fabric.
I learned a few things on this the frist try, so I think the second one will be a bit easier. I plan on a small one as a project bag for small knitting projects (not that I don't have about a million of those already)