You can make beee youuuuuu teeee ful marbled paper using this same technique---just lay the paper on the colored shaving cream and let sit for a few then lift and let sit before wiping.

Some dyes are much brighter than the food coloring---some food coloring is much brighter than the ones from the dollar or grocery; look on line or in the cake deco section of the craft store. Those will give you much more vibrant colors.

You can also make tie-dye or marbled effect eggs by using vinegar and paper towels and a few pieces of aluminum foil----place the foil on your surface. Wet a paper towel with the white vinegar. Not too wet or colors will run and get mixed and muddy! Lay the paper towel on top of the foil. Drip the food coloring onto the wet towels in a random pattern and place the egg onto the paper towel and hold the edges of the aluminum foil and wrap the paper towel and foil closely around the eggs. Let sit for a few minutes and unwrap and let dry. Since you are using only food color and food vinegar these can be eaten.

If you get farm eggs they will not have the wax coating that some commercial eggs have and will take the dye better. Just make sure you get them in advance as they will boil better if a bit older.