i went to a paint shop today, havent been in awhile thought id go to see if there is anything new out. FOund this company that makes all these different kinds of paint, from color shifting to metallics..very crazy. this stuff caught my eye. You paint the valve cover or hood lets say, and after it dries it changes colors with heat....so when your engine heats up the valve covers will change colors, or if someone touches your hood it will leave a hand print in a different color.
http://alsacorp.com/products/xposurepaint/xposurepaint_prodinfo.htm
http://alsacorp.com/products/xposurepaint/xposurepaint_prodinfo.htm