
https://www.springer.com/gp/book/9781461283492
https://www.springer.com/gp/book/9783540158516
Two other books that I think are good (but which are for general audiences) are AK Dewdney's Magic Machine which has a chapter about L Systems: https://www.amazon.com/Magic-Machine-Handbook-Computer-Sorce...
And Computers, Pattern, Chaos, and Beauty by Clifford Pickover: https://www.amazon.com/Computers-Pattern-Beauty-Clifford-Pic...
He's also keeping the 90s style alive with his whimsical Reality Carnival.
http://sprott.physics.wisc.edu/pickover/pc/realitycarnival.h...
Computers, Pattern, Chaos, and Beauty by Clifford Pickover.
https://www.amazon.com/Computers-pattern-chaos-beauty-Graphi...
It's still available, and there are pirate versions if you want to try it before buying it. It's a great book, it's chock full of odd ways to visualise data.
2a) build up a portfolio of programming stuff to show you can program
2b) that portfolio should also demonstrate polite professional communication skills. People discriminate against age (both too young and too old). They shouldn't, but this portfolio might help.
3) Get hold of any of these books, and implement the examples in a modern language.
Computers, Pattern, Chaos, and Beauty by Clifford Pickover (anything in this would be a good ShowHN, especially if you put it on a website with interactive sliders) (it's available as a download somewhere)
Any of the A K Dewdney books eg The Armchair Universe or The Magic Machine.