I too have stitched vinyl in place on 3 sides and actually sewed decorative tape on the edges and slip in pics and change them as the grands grow. It was fun as I put it on a piece of upholstery fabric and used gold rope to hang it with.

i've used regular school elmers glue- cheap glue sticks from the dollar store & liquid stitch- of the 3 the liquid stitch is the most difficult to sew through if you need to- if no sewing is needed it works ok- the glue sticks are my favorite.