Day 1: "Particles, lots of them" Day 2: "No palettes" Day 3: "Droste effect" Day 4: "Pixels" Day 5: "In the style of Vera Molnár (1924-2023)" Day 6: "Screensaver" Day 7: "Progress bar / indicator / loading animation" Day 8: "Chaotic system" Day 9: "ASCII" Day 10: "Hexagonal" Day 11: "In the style of Anni Albers (1899-1994)" Day 12: "Lava lamp" Day 13: "Wobbly function day" Day 14: "Less than 1KB artwork" Day 15: "Use a physics library" Day 16: "Draw 10 000 of something" Day 17: "Inspired by Islamic art" Day 18: "Bauhaus" Day 19: "Flocking"