Mosaic pillars with 8", 10" and 18" diameter PVC pipes as the base. Other examples in this slide show: mosaic flowerpots, stepping stones, garden bench, and steps.
Plants have best friends just like people do. Marigolds help tomatoes and roses grow better. Nasturtiums keep bugs away from squash and broccoli. Petunias protect beans from beetles and oregano chases them away from cucumbers. Geraniums keep Japanese beetles away from roses and corn. Chives make carrots sweeter, and basil makes tomatoes even tastier