Glasses case for Mum

The advantage of being a devoted crocheter is that when a loved one's birthday suddenly looms out of nowhere I can make them something personal. The issue then becomes deciding what to make... Well no such problem with Mum, since there are so many pairs of her reading glasses floating around, mostly caseless and sometimes scratched. The question then became how to decorate the case and how to make it when sitting on the couch next to her without arousing suspicion!