don't let the folding get out of hand -

now that's extreme origami -
http://www.youtube.com/watch?v=Y47ZTc3lSvk&feature=channel

pleated containers a la Philip Chapman-Bell (see oschene)

trying to figure out what the angles and distances should be.
1/tan(360/2n) is the length of the rectangle (=y in the sketch) over the width (=x in the sketch) where the diagonal pleat is made.   The diagonal is a mountain fold on the side that is "outside".

independent lens film

http://www.pbs.org/independentlens/between-the-folds/

If you have not seen it already find the next time it's shown or try to find a local organization showing it - even BPL had a showing in 2009.  

Many references and resources in the links, videos, etc. - bookmark it and keep looking around.