I found this experiment on YouTube.
Honey, Veg Oil, Dish Soap, Alcohol (use food coloring), water (more food coloring!). I put a little of each in ramekins so the density, color, etc could be observed.
First pour honey in glass (don't let it touch the sides).
Then slowly add the dish soap.
Then the colored water.
Add veg oil very slowly down the side of glass.
Add colored rubbing alcohol. Let it all 'settle' and you will see all the different layers. I just wish I had some red food coloring when I did this and that my soap was purple or something - it would have looked cooler that way, but still was pretty neat.