A Bash script that generates the fractal glider logo in different sizes.

fractal-glider.sh

#!/bin/bash

convert -size 1x1 xc:none background.0.gif
convert -size 1x1 xc:black glider.0.gif

# $1 --- background tile
# $2 --- glider tile
# $3 --- output
function make_glider {
	montage $1 $1 $1 $1 \
		$1 $1 $2 $1 \
		$1 $1 $1 $2 \
		$1 $2 $2 $2 \
	-background none -tile 4x4 -geometry +0+0 $3
}

for i in {0..3}
do
	next=$((i+1))
	make_glider "background.$i.gif" "glider.$i.gif" "glider.$next.gif"
	convert "background.$i.gif" -scale 400% "background.$next.gif"
done

rm background.*.gif

convert glider.*.gif -trim +repage -bordercolor none -border 10x10 glider.%d.gif