As if I needed one? I've started painting rocks and hiding them around places I visit. There is a great group of folks on Facebook that got me into it. Here are few pics.
I once found a toothpick that the previous camper had whittled one end into a flower by splitting it and shaping the pieces. Pretty neat. I figured he did that to leave behind as well.
i used to carve monkeys from peach pits and leave them sitting around for kids to find. Also carved flowers on the inside of pit halves and leave them around the church like Easter eggs. Can't/don't carve like I used to, but considering leaving little forged crosses laying around for those in need - that's all of us folks!