I want to put filler illustrations into Flatland (the novel, not the game) at three or four points where chapters end awkwardly near the bottom of a page and I don't want to start another in the same column. I want to make it clear that they aren't part of the book, but I don't want them jarringly obtrusive.
Some sort of monochrome fractal (maybe something like a tiled mosaic sort of thing) seems the best bet, e.g.

reduced to fit at the bottom of a column.
Any suggestions, or alternatives?
Some sort of monochrome fractal (maybe something like a tiled mosaic sort of thing) seems the best bet, e.g.

reduced to fit at the bottom of a column.
Any suggestions, or alternatives?