I started learning crochet when I was studying diploma with another friend of mine. I learnt the basics and then used my own imagination to make a cute multicolored sling purse, a nice college purse, a pouch to keep my stationery and this cover to keep my scientific calculator. I don't know where the rest of the things are but I do have this one and we use it to keep hard disk these days.
It's a simple pattern. I made it length wise (2 rows of single crochet with one color then switch to another color and have 2 rows of single crochet with another color) and then folded it and stitched it on the side. Since i needed width I ended up doing a double crochet while stitching the side.