VELCRO Brand HANGables Removable Wall Fasteners 1-3/4 in. x 3/4 in. Strips (4-Count) in the Picture Hangers department at Lowes.com
Amazon.com: VELCRO Brand HANGables Removable Wall Fasteners | Strong Adhesive Hold, Up to 7.5 kg / 16 ½ lb (per set of 4) | Easy-to-Remove from Wall, Firm Hold to Frame or
Quilt Hanging Tip: Using 3M Command Strips, by Shirley Wooten
VELCRO Brand HANGables | Removable Wall Fasteners | Decorate Without Damaging Your Walls | Hang frames,
Simple Ways to Hang Pictures with Velcro: 10 Steps (with Pictures)
Command Medium Picture Hanging Strips, Damage Free Hanging Picture Hangers, No Tools Wall Hanging Strips for Living Spaces, 16 Black Adhesive Strip Pairs(32 Command Strips)