Thanks for sharing! I too miss small projects just for the fun of it.

The FOV/FOV+Z technique is one I remember learning from early 90s computer magazines. They would have code snippets for QBASIC with various neat programs. We’d then retype them in the computer, play around with parameters and just learn.

A while ago driven by the same motivation as you I created a tree drawing alorithm. Also something I learnt from the old magazines and recreated from memory. https://www.kristapsenkuzens.com/tree/