I'm stealing this one from the strong start program....
Black And Bright Art

Using black construction paper let your child draw onto it with bright coloured PASTELS , these are super easy for your child to work with, Mr. K is 15 months old and had a blast scribbling on the black paper...
Bright blues and Yellows and white pastels showed up the best. and if you want to keep this beautiful work of art archival and not get all smudgy , simply spray the paper with either hair spray or clear spray paint, they also make an art spray for chorale drawing this can be found at craft stores, but the hair spray works just as well and its much less expensive...