The slightly heavier felt (in 40x40 cm pieces) is incredibly useful. For example, use a sheet to make a mat and a mug holder. Cut a 10 cm wide strip. Wrap it around the glass/mug and cut off the excess material (save about 2 cm extra to sew the edges together). Sew a blanket stitch around the edges and the seam. Decorate the big piece (base) and the mug holder with embroidered seams in various colours to add a personal touch.