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Snippet from Earth911.com:

5. DIY lava lamp

Now you don’t have to take a trip to that creepy Spencer’s store in the mall to go back to your teenage years.

OK, we’ll admit that this design from Simple Earth Media doesn’t have the zing that your old $40 lamp had, but it’s no doubt a fun rainy day project for the kids.

Difficulty level: Beginner

What you’ll need: plastic water bottle, vegetable oil, funnel, water, food coloring, masking tape or glue

How to make it:

1. Peel of the label and wash your bottle. Fill 3/4 of the bottle with oil.

2. Fill a measuring cup with an equal amount of water and add a couple of drops of food coloring.

3. Pour colored water into bottle of oil. Secure cap with glue or masking tape, and have a great time.

Bonus tip: Make sure your kids appreciate the oil-doesn’t-mix-with-water analogy before splurging on that real lava lamp.

Source: http://earth911.com/news/2010/07/26/6-ways-to-reuse-plastic-bottles/