My hubby ordered two iPad 2 covers. I made fabric covers for the original iPad but he gave me the spare one to alter. I used Zendoodles (also known as Zentangleing (tm)
Step 1: Test your markers
I tested out a number of markers on the hidden hinge area to make sure they would not smear or bleed
Step 2: These markers work very well
The Sharpies are the best as the stroke marks show less. The Bic and the Uni markers give a deeper, richer black but the stroke marks are very visible!
Step 3: Copics work too!
Copic markers (and I am guessing ProMarkers, but I didn't test those so do so before using them!) work well too. That opens up a whole world of colouring possibilities!
Step 4: DO NOT USE THESE!
They smear. The Micron pens are lovely for paper but not on the iPad cover! The Sharpie pens for writing smear too. Note the package says "Won't Bleed through paper" but not that they write on anything like a real Sharpie.
Step 5: Practice on paper first
You can choose to treat each strip as a different area, as I did, or try treating the whole cover as one continuous area.
Step 6: Things that will help
There are books that will give you pattern ideas. Plastic templates will help you draw crisp lines or patterns if you are a bit ham handed like me! There is no way to "erase" a mistake. Real zentanglers embrace that. I didn't want to mess it up so I was more cautious.
Step 7: Another tip! Use a transparency
If you want to test out a pattern, you can lay a transparency over the area and doodle on that. That way you can test out your pattern first to make sure you are going to like it. Not very zen, I know. Can you also see how I mask off each area as I work? That keeps the dividers between sections clean. I then outline around each division.