If you have an old house with a septic tank opening that's under ground, here is a crafty way to cover it up. Get a pot big enough to fit in the opening, with a top wide enough to fit over the edge. Fill it with some pretty flowers and put a boarder around it of your choosing. I chose this one. You could also do a stone boarder. It makes it safe by not having an open hole in your yard and it's pretty. Enjoy!