3ee1011a ​

input = fill #0 (fill #1 black) |> fold rect #2
output = fill #3 (fill #4 #5) |> fold (fold rect) #6
(VInt, HInt, UList ((VInt, HInt, VInt, HInt), Color), VInt, HInt, Color, OList UList ((VInt, HInt, VInt, HInt), Color))
(23v, 29h, {((13v, 9h, 13v, 12h), green), ((10v, 16h, 10v, 16h), teal), ((5v, 4h, 5v, 8h), red)}, 5v, 5h, red, [{((2v, 2h, 4v, 4h), green)}, {((3v, 3h, 3v, 3h), teal)}])
(21v, 22h, {((9v, 9h, 10v, 9h), fuschia), ((4v, 5h, 7v, 5h), green), ((3v, 14h, 8v, 14h), blue)}, 6v, 6h, blue, [{((2v, 2h, 5v, 5h), green)}, {((3v, 3h, 4v, 4h), fuschia)}])
(24v, 20h, {((1v, 15h, 8v, 15h), teal), ((16v, 8h, 16v, 13h), green), ((10v, 10h, 13v, 10h), yellow), ((9v, 5h, 9v, 6h), orange)}, 8v, 8h, teal, [{((2v, 2h, 7v, 7h), green)}, {((3v, 3h, 6v, 6h), yellow)}, {((4v, 4h, 5v, 5h), orange)}])
(21v, 23h, {((13v, 11h, 19v, 11h), teal), ((12v, 3h, 12v, 7h), fuschia), ((7v, 11h, 9v, 11h), orange), ((5v, 7h, 5v, 7h), green)}, ?, ?, ?, ?)