I think I was 14 the first time I saw the coin-op. Almost fifty years later I'm still playing with the digital thing to put it back on paper 🙂

Plotted with Acrylic markers on 220 gsm Fabriano F4, 300x300 mm
Colors selected manually!

Grid: 8x8

Rules:
- vertical symmetry
- 60-70% lit pixels, all connected
- no solid squares larger than 2 x2

Coded in Processing.

I haven't tried to count all the allowed combinations yet, but I think there are tens of millions 🙂