P.S. If you're looking for a theme for your iPhone, here's one I made: http://supertod.deviantart.com/#/d2y8t2r
Step 1: Requirements
-Electrical tape (optional for colour)
Step 2: Duck Tape Sheet
Place that face up on a flat surface and stick another >10cm on it, half way from the middle(p2).
Fold the white bit still showing over(p3), then turn it over.
Keep sticking the tape on half way, and turning it over etc until you get to at least 15x10cm
Step 3: Cut Sheet to Size
Step 4: Lower Grip
If you would like a hole for the home button, cut that now, but it can weaken the structure.
Add tape to either side of the strip (p3) and stick to bottom right corner of the previously made rectangle of tape(p4).
Bring the other edge over and stick that to the back of the other side(p5).
It helps to have the phone in place at this point so you can adjust it to fit right.
Step 5: Higher Grip
Step 6: Add Flap
Then tape it to the back of the case firmly so there is a flap which covers the screen(p2).
Step 7: Add Catch
Step 8: Seal Bottom. (lol)
Stick it to the bottom of the case so it seals it up nicely(p2).
Step 9: Fin.
You may want to leave it under something heavy and flat (pile of books?) overnight so the cover closes better.
Thanks for reading my instructable, please leave feedback and suggestions :)