A bubble generating apparatus includes an air flow generator, a liquid tray defined by a floor and sidewalls and having one or more bubble forming ports therein, and a pivot arm coupled to a motor for pivoting the pivot arm about an axis so that during pivoting a bubble generating member of the pivot arm passes over one of the bubble forming ports, the air flow generator positioned to direct an air stream through the one or more bubble forming ports, and a gravity feed liquid reservoir, wherein the liquid tray is configured to generate bubbles from the liquid when the air flow generator directs the air stream through the one or more bubble forming ports while the pivot arm pivots about the axis.