More to explore:
Crochet Inspiration ~ would work in fabric too
PIC ONLY but I think I could figure this out. Fish pencil case. or crochet hooks lol :)
crochet and sewn fish drawstring bag
Cute idea! http://gedane.over-blog.com/article-the-serial-crocheteuses-n-125-107965519.html
cute little bag design
rainbowsandunicornscrafts: DIY Crochet and Fabric Fish Bag from Happiness by Gedane here. *No tutorial, but you could do this all in fabric and then gather it at the top.
A very cute pencil case crochet bag.