There are some very cool thinks besides from games you can programm like lindenmayer system or langtons ant.
What I got so far is…
Mandelbrot set, langtons ant, lindenmayer system, conways game of life and some noise functions.
And i am looking for more stuff like this.
many interesting stuff on these,
Category:Programming Tasks - Rosetta Code (all kinds of small algorithms in different languages)
http://www.redblobgames.com/ (AI, procedural gen, path finding…)
Category:Articles - RogueBasin (2d dungeon generation, visibility)
Thx Category:Programming Tasks - Rosetta Code looks really promising.
Just so many links to check 
Flocking behaviour is always fun
yeh do dem boids brah
Flocking behavior looks awesome will post some pics when I am done
Spell checkers are also a bunch of fun. The classic algorithm work for suggestions is done by calculating the Damerau-Levenshtein distance of words.
cough
After i got pissed off by uniyts threading policy i switched to java here 2 pics of 2500 boids doing boid stuff .
There is still to mutch overlapping and i wonder how good they can handle a maze 
Cool! If you want to implement a fun algorithm I recomend marching cubes. The result is usually pretty sweet.
Yea was thinking about to implement it into my voxel “engine” and it is definitely on the to do list
