This was my little (or not so little!) project the other day. I bought some calico, dyed it a light grey colour (that was a mission and a half considering the calico didn't want to take the colour at first - went through TWO bottles of powder hahaha), made the three felt flowers like I explained a few blog posts back, and hot glued them on. I included a couple of images of the base of my bag to show you how I achieved a flattened bottom which I like. I simply pinched the corners of the bag into triangles and sewed a straight line across the triangles on the inner side. Voila! A base!