Like stone aggregates
, pieces of tumbled glass recycled from old bottles and jars, can be used for a natural-looking mulch with textural interest. Ranging in color from soft sea glass hues to rich jewel tones, this mulch can be used over landscape fabric, a synthetic fiber blanket, to thoroughly suppress weeds. Since glass can be a hassle to move, this mulch works best with established beds, such as foundation plantings. Also, be sure to apply it in areas where it won't be tossed around by lawn equipment.
Sea Mix, from Bedrock Industries, $3.59 per pound.