This is also very easy.
1. You'll need something colorful like a tie-dyed shirt, piece of cloth, or anything with various colors on it. In this case, I used 8 sheets of construction paper in various colors (actually my daughter thought of this) and aligned them so you can see each color vertically.
2. Use a clean but shallow glass dish (I used a Pyrex baking dish) and fill it one quarter (.25) or half way with water. Add a few drops of cooking oil and take a fork or toothpick and gently swirl it around to break up the oil bubbles that are floating on top of the water to make a lot of small oil bubbles of various sizes. Then wait for the bubbles to stop moving so make sure you swirl the oil gently so they will stop moving a lot faster.
3. Lay the colorful object(s) on a table or floor.
4. Sit the glass container with the water and oil on something that will support it like two glasses or cans...one to support each end. You only need the glass container to be 5-10 inches above the colorful object.
5. Set your camera to macro mode, get as close as you can while aiming at a spot that you cannot see the supports in your viewfinder or LCD and shoot!
Remember when shooting in macro mode you should always zoom all of the way out and NOT zoom in. Also, using a tripod will work best and DO NOT use the flash!!! The flash will make "blind spots" (too much reflection from the flash) that will ruin your shot. It is best to do this in a lot of light like outside in the sun or near a window or lamp. The glass, water, and oil will reflect the light even if you do not have a lot of light.
The water will show the true reflection of what is under it. The oil will reverse the reflection of colors. The great thing about this is you can never get the exact same pic twice. Try placing the oil bubbles in the exact same place and sizes the next time you do it.