I found this adorable tutorial for boxes made of fabric, and thought they would be perfect for my dear sister-in-law's birthday.
I made a 12" and a 14". The 14" is a much nicer size, and there was less wrestling with the fabric. I don't think I would ever do one smaller than 12" unless I used a lower loft batting. They only took about an hour each to make, so it's a great quick project. Hers definitely look "crisper" than mine, but I'm pretty happy with the result.