1. Squeeze some ink or paint into a mug/bowl with about 1/2inch of water in it, add a squirt of washing up liquid. Stir the paint, washing-up liquid and water together with the spoon.
2. Put the straw into the mug/bowl and blow to make lots of bubbles so they overfill the mug/bowl.
3. Gently place the paper on top of the bubbles and take if off to reveal the bubble impressions. You can do this several times to make your picture and even do it with different colours.