For a quick and uniform colony, try using this Spooky Bat Moon Halloween Bullet Journal Stencil with distress inks or dry-sponged watercolor paints!
FUN FACT: Bats aren't all that bad! The golden crowned flying fox (Acerodon jubatus), also known as the golden-capped fruit bat is a rare megabat belonging to the species of fruit bats. Inhabiting the forests of Philippines, they are one of the largest bats in the world, with a wingspan of 1.5–1.7 meters (4 ft 10 in–5 ft 7 in) and weighing 0.7–1.2 kilograms (1.5–2.6 lb). They won't suck your blood, however, in that they're harmless vegetarians, feeding on fruits and leaves. So maybe they're actually more coo than boo!