I found a fun, cheap, and easy project in Family Fun magazine about making Lava Lamps with things you already have in your house.
Fill each bottle a little more than half with oil:
Then fill the rest of the way with water. Leave about an inch at the top:
Now add 10 drops of food coloring:
and drop them in one piece at a time. Wait until the first piece stops bubbling before you drop in the next. If too many go in, you solution gets all cloudy. Don't worry, he's not hurt. The band-aid is merely decorative...as is the tattoo. Match those up with the black socks pulled to the knees he likes to wear, and I have got quite a little ladies man!