The simplest outdoor bench ever! You can make this fairly cheap, if you don't already have the materials left over from other projects, and the best part is you can take it apart and reuse the materia
I like this 30 Charming Porch Ornament Concepts that Will Make a Beautiful First Impression.
Garden Landscaping with Stones Upcycle Art (shared via SlingPic)
DIY Cinderblocks + 4 x 4 beams + paint = Instant Bench! Use concrete Adhesive to hold cinderblocks together.
Put a brightly coloured cushion on top and great seating. 19 Backyard DIY Spruce-Ups on a Budget - Great Yard Ideas