Do something from The DailyWTF or ProgrammingPraxis
Hosted by Code Retreat Boulder
Details
https://thedailywtf.co... (https://thedailywtf.com/Series/Bring_Your_Own_Code.aspx)
https://programmingpra... (https://programmingpraxis.com/)
Lots and lots of "one-off" programming exercises, along the scale & complexity of implementing Conway's Life!