When we get old we get greyish. But on the inside our souls get more and more colourful with each passing day. It is the same with all living things. Souls aren't like skin - souls can grow to be hot red and shimmering purple or maybe cool green and blazing yellow with a gold inlay.
This is a tree of sparrow souls. Drab in our world gorgeous when they return to the source of life. I think of it as sacred razzle dazzle.