Supplies from left:
shallow bowl of water
Dawn dish washing liquid (this brand seems to produce the best effects)
substrate of your choice
Add about twenty drops of color and a small amount of soap to the water
Without stirring your mix, begin blowing through the straw. Be careful not to inhale into, or suck on, the straw.
Continue blowing until you have a mound of bubbles well above the lip of your bowl.
Using very little pressure, quickly press the substrate into the mound of bubbles, being careful to avoid the lip of the bowl. Have your substrate nearby and work quickly, because the bubbles have a tendency to pop if you allow them to sit too long. Blow more bubbles, then repeat. Always blow bubbles each time. For a different effect, allow you substrate to dry and add more than one color to the page.