These are ATC size (2-1/2" x 3-1/2") but would be good behind the window of a castle or haunted house, too. A couple of the images are ghostly versions of tykes from the Little Sweeties Collage Sheet.
Thisheet is also included in the Mini Haunted House Kit; see all the other kit components.
Exclusive to Alpha Stamps by Artfully Musing.
Design Team Member Laura Carson made The House of Ghosts (see the wide photo below). More info in the blog and/or see the supply list.