We have a new Kobo in our house, and it's manly used by my hubby. We decided we needed a simple sleeve to put it in when it's not in use, or when he has to bring it in the car with him.... He reads in the car while I'm in the store shopping.
So this is actually my second Kobo case that I've made in two days. The first one - the prototype - is similar and is shown on my blog, with simple measurements if you want to make your own.