Finding Lost Farm Animals
Here's an out of the paint box idea, perhaps you could use it on animals on your farm to help locate them in the dark. Would have to be ones with horns. Or just use reflective collars if they would keep them on.
"To avoid deer strikes, Finland is painting deer antlers with reflective paint. Every year, about 4,000 reindeer lose their lives on Finnish roads in car accidents, causing 15 million Euros of damage every year. And now, the Finnish Reindeer Herders Association is testing out a new way to make the large mammals more visible to drivers: reflective paint."