Sock + Scissors = Most comfortable iPhone armband EVER. ~Honestly, I'll probably never actually need this for running but I do need this f.
DIY sock iPhone armband for running by The Art of Doing Stuff,
How to Sew a Waist Pouch/Belt for Jogging - Free Tutorial
Yes, I know this is a glorified fanny pack, but it's still pretty awesome. No more slipping arm band on the iPod! Running Belt Tutorial via Erin of the Sewing Rabbit Team
DIY Weave bracelet - simple yet colorful, for running a arts/crafts club.
Ipad Sleeve Case Tutorial & 25 Things to Sew for your Gadgets, device sleeve, tablet, notebook, laptop
DIY iPhone Arm-Band from Sock.I tried this today and it worked great! I used a "fun" sock to pretty it up some :-)
RUNNING BELT - Concept for DIY waist belt with pocket for when hiking with Sophia in Kinderpack on my back.
DIY Armband Case Tutorial for Touchscreen Devices - Melly Sews