How to make wax appear to have bubbles when hardened?

Question

My father had a beer mug that someone had made into a candle and it looked just like a freshly poured beer. The golden brown wax had the odd tiny bubble, but the foamy looking head had tons of bubbles of all size.

We'd like to recreate this as a home art project..... (and the crayon box is over flowing)

Any suggestions on how to create the bubble effect?

Answer 1

The warm (NOT hot) wax is "whipped" with an electric mixer. Did this back when I was a teenager and candle-making was a peaceful pursuit ;-)

Answer 2

use crushed ice as a form