the first what we need will be a metal´s can or any box that we have.
With the tape of the can draw a circle on the fabric jean... leave a surplus to paste to the can :)
Will be somthing like this when you cut it:
Put glue in the base of the can.
Paste the fabric in the base, maybe you need to do a little cuts in the edge of the jean.
Now cut a strip for the other part of the can.
This part will have a surplus too.
Paste with glue the strip of fabric.
draw another circle like the firts and paste at the reverse the sponge, this its ocpional, to put the pins.
Paste it on the tape of the sewing box
Will be somthing like this :)
Now I´ll put some to decorate.
I sew a lace. And thats all :)
Now look pretty :)