Another natural pinkish red colour are these old acorns you can find in areas with mature oak trees. When acorns are lying on the ground for some weeks or months, they begin to dry out and open up (or get eaten bij rodents or jays) and start turning pink or even red. It’s quite a nice colour. So when you are walking in the woods with a lot of oak trees you can find your path littered with glimpses of pink and red, which can make your day a bit brighter yet again.