Browsing Pinterest I came across this image by Elementary Art Resources:
What I liked about this is that it would make me need to think as creatively as the artist who doodled it first. How do I do each image? How do i do all these images in one piece of code? Will it still be (reasonably) performant?
The pen has ended up very heavy, so it's probably best to view it in debug mode.
This is the 63rd project since Jan 1st 2019, marking one a week up to my 35th birthday! Challenge complete!