Anything with complex graphics, particularly where individual pixels are written that cross over between controller chips (x = 64) would be a good test. Also where pixels and/or lines are drawn across page boundaries (there are eight pages in the controller, each 8 bits high starting from line 0)
A simple but effective test is to copy small monochrome bitmaps to the various locations in the panel using WriteData.
I probably won't have the version ready tonight, I will pm you and Hulk when it is available.