Ronald Sutherland created a PCB with a self portrait on the copper layer:

Self Image on Circuit Board

I guess at some point everyone does this…

Ronald has shared his project on OSH Park:

Source: https://oshpark.com/shared_projects/VyQy9Vcn

Source: https://oshpark.com/shared_projects/VyQy9Vcn

OSH Park Shared Project

2 layer board of 1.86×2.36 inches (47.14×59.87 mm).
Shared on January 30th, 2015 21:48.