Here're instructions for making an eye-catching hoodie for your laptop to use in public spaces for warmth and privacy. These are more sculptures than they are practical devices, and as such they're a fun challenge for knitting because of the complex form. A great site for learning a bunch of different knitting techniques with fantastic videos is knittinghelp.com. You can read more about this project, which is part of a series of similar devices, at my website.
What you'll need:
-a laptop computer, pda, or other electronic device
-yarn (I used about 10 skeins for this)
-knitting needles (straight, double-pointed, and circular)
-a sense of humor