10 print chr$(205.5+rnd(1)); : goto 10

[glv]

A bit leaner than my last version.

size(529,529);for(int x=1,y=0,n=23;x<n*n;x++){int r=int(random(2))*n,t=x%n*n;line(t+r,y,t+n-r,y+n);if(t==0)y+=n;}

size(529, 529);
for(int x=1, y=0, n=23; x<n*n; x++)
  {
  int r=int(random(2))*n, t=x%n*n;
  line(t+r, y, t+n-r, y+n);
  if (t==0) y+=n;
  }

:)