I've always thought, "too bad that mold and mildew stains are so toxic and unsightly." Just think, if the microscopic organisms could be designed to stain your wall a lovely shade of "winter wheat" or "lemongrass".
I have no idea how this could be accomplished, however, I'm certain that we have the technology to train microbes to produce colors.
Wall boards or cement could be created with certain biological media growth promoters built right in. Once the liquid microbes are lightly sprayed onto the surface. 24 to 48 hours later the microbes have bloomed, producing a long lasting stain.
The beauty of this system is that the microbes will only grow on surfaces containing a growth media. So a person could come in and quickly spray the walls or floors of an entire house without having to worry about taping off the windows or moldings. The microbes would only grow on those surfaces meant to be stained.
Gimme a bun!-- veryvermilion, Jun 21 2007 Moldy walls http://www.edcross....llette_Stuttgen.jpg [veryvermilion, Jun 21 2007] More Moldy Walls http://65.254.85.56...ics/ceilingmold.jpg [veryvermilion, Jun 21 2007] //too bad that mold and mildew stains are so toxic and unsightly// not to mention the smell.-- Ling, Jun 21 2007 I will give you a bun, but I want to have different hues at my disposal in order to create mouldsaics.-- 2 fries shy of a happy meal, Jun 21 2007 that's just nasty.-- abhorsen1983, Jun 21 2007 Martha Stewart paints things with yoghurt and then watches the molds grow on them.-- xandram, Jun 21 2007 random, halfbakery