Images, generated with Context Free. The description of an image is in the form of a context free grammar and is called a cfdg file (context free design grammar). Some of the files were initially written in Context Free Version 2 (many years ago) and automatically translated to Version 3.
Install Context Free depending on your operating system. Open a chosen cfdg file and generate an image.
On Linux:
cfdg -s 565 cosmic/cosmic.cfdg ~/output/cosmic.png -v PIPHRD