I remixed DrewPetitclerc's Galaxy Note2 case to make one for my phone and my dad's.
I wanted the writing to be subtle enough that it looks like a pattern on initial inspection.
Below are two versions, one which is for use with the regular backing, the other one which can be used if you have a Samsung brand flip cover (it may work with the unbranded ones, I haven't tried), which is slightly thicker, so one side is taller.
I printed these without any supports or rafting with no problems, so that is possible, though you will have to do a little bit of tidy for some messy edges.
I also found I had to level the build plate further away from the extruder than I usually would. I had some jams before this, but just a fraction lower fixed it.