This is intended as demonstration of a method, i also created a similar file for 1920X1080 with 8 parallax layers and a bridge, i'll publish it here in the near future.

I didn't despeckle those files in order to allow maximum flexibility of use, if anyone is interested.
If you need this despeckled but don't know how to do it, i'll add a despeckled version.

Now i'm thinking about a reasonably light animation of a sea of grass seen from a running train.

When i'll have the time i'll look into creating a tileable version of those animations, for platformers or scrolling beat 'em up (or shoot 'em up, who knows?)