Here is a tutorial for an easy peasy bus pass/card holder. If you download the doc from Scribd, it looks better. For some reason on Scribd it is displayed in a strange way. One thing I couldn't fit on the page; when done, give the card one more press with a shot of steam (remember to keep some greaseproof paper inside to stop the plastic sticking), then quickly put a heavy book on top. This will make it fold flat.