A former volunteer-tree & weed patch is now a focal point at Dirt Cottage.
Bad things chopped to the ground, I took three sections of a broken tree limb and formed a triangle. Recycled some newspapers by putting layers over the ground and holding them down with the limbs.
Poured some water on the newspaper to plaster them down, and then took half a bag of mulch and spread it on top.
Pulled out an old bird bath and settled it on top. The whole thing took about half an hour.
If you don't have a bird bath handy, a planter or some interesting artifact will give your new bed a bit of punch.
My new feature is in a naturalized strip under the ancient oaks, so the tree-limb triangle fits in. You could use stone, bricks or cement edgers with a little more time -- whatever works with your garden.