Here are some more interesting sites and ideas around bio-plastic...

Interesting website on Bio-plastics:

http://green-plastics.net/discussion/54-student

The Book: http://greenplastics.com/wiki/Green_Plastics_%28book%29

http://materialsprocessesuw.blogspot.co.uk/2012/12/decompouch.html

Amy Westrick and Chuong Tonnu have come up with the idea of making bio-degrable food pouches for birds.

http://www.engineeringessentials.com/doeexperiments/bioplastic.html

MindFlip:

http://jaycousins.wordpress.com/2010/02/08/bioplastics-the-quest-for-open-source-material-production/

http://makezine.com/2008/08/21/make-your-own-potato-plas/

Shapeways

http://www.shapeways.com/blog/archives/374-cooking-molding-bioplastics-at-home-recipes,-results-tips.html

Video:
http://www.shapeways.com/blog/archives/371-laser-cutting-bioplastics.html

http://picasaweb.google.nl/lh/photo/GxPLANQv8_ttDghGlq1XKA?feat=directlink

http://dailyartmuse.com/2010/02/05/make-your-own-plastic-sheet/

Natural Colours:

http://www.gracefruit.com/natural-colorants/