There still should be room for a moonset, sunrise (light variation on the ones released: moonrise and sunset) and to fill the gap between morning and noon by adding a 'Pre-Noon' (?) and 'Afternoon' between noon and evening.
Then a more seamless loop can be formed.
I was thinking of letting each wallpaper run for some time and spread them around a 24 hours period.
All this according an average day/night spread, for instance our temperate spring / autumn would do just fine.
After that you could even create a midnight sun summer edition.... for North Canada, Greenland, Iceland ... and maybe even flip-reverse your landscapes + moons for an Austral / Southern Sky release.
Once reduced we bring in the Basic Black dual display sized backdrop of Basic Black 3120x1024.
And next with that opened we add a few extra layers on top before introducing the reduction with only a slight touchup on one side from 3100 to match the 3120pixel width and we end up with.....
A rather interesting fuller view while the aspect ratio from the original remains the same.