How to set a different wallpaper for each separate home screen:
[screenshot, steps 1 to 3] [screenshot, steps 4 and 5]
You'll have to paste in the appropriate Kode formula to work for your specific number of screens. If you need to adjust the formulas, I'm aiming to have equally-distributed colors, distributed across the hue (H) part of the HSL color space.
Six screens wide, with the home screen being #2: $if(si(screen)=1, #880088, if(si(screen)=2, #880000, if(si(screen)=3, #888800, if(si(screen)=4, #008800, if(si(screen)=5, #008888, #000088)))))$