Pretty simple: I changed the number of "ninja stars" (abstract four-point paths), shifted them around, and moved some of them into a new layer so two-color patterns could be made.

I also removed the "test" layer, which had accidentally showed up as two tiny dots in my first plot. :P

The original was great to have, but I made these tweaks:

- The labels have been replaced with larger text generated using the Hershey Text extension. These labels should be now be super-legible, even on objects as small as ping pong balls. :D

- After looking at Inkscape's y-axis orientation and the eggbot pen-motor orientations, the y-position labels have been vertically swapped.

- The paths are now organized into layers named "Grid Lines", "Direction Markers", and "Labels". :)

Future changes: I intend to create some additional variants for heights of 950, 900, and 800. It might also be handy to have some regular-grid designs without labels to make it easier to pencil-sketch on a reusable ball and then transfer that design to Inkscape.

EDIT: Silly me, I forgot to promote Hershey Text! Download it now!
evilmadscientist.com/article.php/hershey

My first Thingiverse design is a Metroid/Tron mashup for plotting on spheres!

Want to see a 15:1 timelapse of the blue ball being made? Of course you do!
youtube.com/watch?v=UwzBYi5POJA

Mostly copied from the video's description:

The style worked very well for learning some new features in Inkscape! Most notably grid-snapping and tiled cloning (tessellations). :)

Design and prototyping was done in one night, with most of the prototype balls only taking a minute or so to plot because they were done as outlines only. The final 2 balls took about 11 minutes each due to the large fills.

The timelapse was taken at 1 photo per second, and played back at 15 fps. Unfortunately, this 15:1 time scale is basically as low as my phone can go while producing a decent movie. :P

BONUS! If you look closely, you can see a small wake behind the pen where the ink is drying!

BONUS! It's ridiculously tempting to even take the current design and plot it onto one of those motorized balls that randomly roll around! I can't seem to find a link to a simple version, but this pool-toy displays the basic idea:
amazon.com/Swimways-Crazy-Chase-Dive-Ball/dp/B0036FTLXI

BONUS! I'm friendly! Comments are super-welcome! :D

Rather simple: I thought it would be interesting to see what a symmetrical design looked like, so I flipped two of the four hearts vertically.

The file is also now 3200x1000, which if I'm not crazy, seems to have fixed my plots inexplicably coming out a little too high up on the ball.