The Touch quilts that my guild makes for Alzheimer's patients at the nursing homes are usually about 40" square. Some people refer to them as figit quilts and they are all about the texture and "feel". Many people with advanced dementia seem to spend a lot of their time rubbing or flailing their hands and seem agitated. The quilts are a good size to cover their laps and give them something to stoke or pick at. We choose the fabric for the texture, everything from upholstery, corduroy, terry, Minke, fleece, flannel, nubby, satin or anything else that feels different. We also use trims such as giant rick rack We just used simple squares, 8 1/2" as I had this size ruler and 25 squares would make the approximate finished size. Happy stitching for some very needy deserving seniors.