21. Sol LeWitt + 3 Colors 🟧⬜️🟩

size(800,800);strokeWeight(8);int i=0,x,y,s,c[]={#15616d,#ffecd1,#ff7d00};while(i<999){x=y=18*(int)random(40);s=18+18*(int)random(9);fill(c[++i%3]);rect(0,y,800,s);rect(x,0,s,800);fill(c[++i%3]);rect(x,y,s,s)}

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