LavaRnd - Cryptographically Sound Random Numbers Generated Via LavaLamp
Ahem. "LavaRnd™ does not use LAVA LITE® lamps. LAVA LITE lamps were used in SGI classic lavarand™"
See the "Difference between SGI classic lavarand and our LavaRnd" page.
Yeah, I recall ones from long ago too, but not sure when (that particular one lists 2000).
Still, this is a great idea, however old it is.
You probably saw the actual SGI Lavarand, circa 1996.