The setup:
The moon, 4 images enlarged 300% and stacked, then reduced 70%, greyscaled:
Mars:
Uranus (the pale blue/green one in the center), 3 images stacked:
M13 (the little fuzzball in the center), 3 images stacked:
Alberio (the double in the center), one image, not quite enough zoom/resolution
to seperate the 2 stars cleanly: