Silkworms can be put on a special diet of mullberries and fluorescent dye to produce fluorescent silk.   According to researchers at the Institute of Materials Research and Engineering (IMRE) in Singapore, the process is “simple and cheap enough to be translated to an industrial scale,” which would be more environmentally friendly by reducing consumption of water and dyes.  This approach could also potentially be adapted to create functional silk with antibacterial, anticoagulant or anti-inflammatory properties for use in wound-dressings.

http://www.newscientist.com/blogs/shortsharpscience/2011/03/silkworms-produce-fluorescent.html