I put a pin in the middle and then go around the edges with a blanket stitch and 3 strains of embroidery thread in a contrasting color. If you don't know how to do a blanket stitch, just whip stitch edges together. One side is the folded side, so you don't need to sew there.
When finished sewing the edges of the case, set aside and make felt flowers. I just cut the felt free hand into 5 scallops as shown. Now, take a needle threaded with regular sewing thread and do a gathering stitch across the bottom of the scallop piece. Pull up the thread and secure it....you now have a pretty little flower!
Felt flower. You can use a button as center. Or a bead, or make a little felt center. Be creative here!
Here are some flower varieties.
Decorate your holder with flowers You can also do some embellishment with embroidery or cut little felt leaves to apply. You can glue the flowers or or sew them. I have done both.