Well quite awhile ago, mabye a year I figured out a technique for animating 3d ground all in paint
I don't really remember much but I think this is how it goes
First: Make a square
Second: Stretch/skew the square horizontally
Third: Do that with more squares, but with each square getting closer to the center stretch/skew it less horizontally
Fourth: (If a 2 color checkerboard just easily push the black/white color a few pixels, and replace that empty spot with the other color
Fifth: Once you have them all animated see if they go together by resizing each row to fit the row below
Sixth: Put every animation on each of the rows identical to the other animations, (you might mostly not do it perfectly though)
Seventh: Now use a gif animator to see what you have done, then ending result may not be that nice to look at though.
Also I didn't really focus on looks for this one, just animation, sorry if it is all blocky everywhere that's how it came out.
Oh yeah and in all, there are 14 frames