3M gave me a free sample of its Command Picture Hanging Kit to evaluate. The kit contains a variety of damage-free strips that can be used to hang anything: posters, wire back pictures, sawtooth backed pictures, etc. I wish I had discovered this kit years ago when my husband was active duty military. I was so concerned about damaging walls in base housing that our homes were barely decorated -- even during the holidays. The kit would have allowed for year-round and seasonal decorating with no holes from nails, thumbtacks, etc.