I'm sure you have seen this suggestion many times, but just in case ---- Purchase one of those cheap plastic table cloths that has a flannel backing, hang it from a wall with the flannel facing out -- I had room in a hallway--- our quilt block can be placed on the flannel and if we sort of pat them in place will stay there. This has worked very well for arranging and re arranging my quilt blocks. If I have trouble getting one to "stay put" I just slip in a straight pin.