I made a weighted blanket for my grandson with Rob Apell's direction on Man Quilting but I made it larger. I too like the weighted feel and have a heavy floor length kingsize quilt for my bed. Not weighted with pellets but just from the huge size. The pellets I ordered online are machine washable and machine dribble. Look for that as not all pellets are. The nylon invisible thread comes in a clear and a smoke. You could use a variegated thread and slightly wavy lines as a design element. Then no worries about it showing or keeping the lines straight.