They sure should have used DPMD in Beatles For Sale; to give a little justice to Ringo. I don't know what else George had. But, if John and Paul had said 'George, with 30 songs, you can really show what you've got with this album', or the like, I'm sure he could have shown us some good stuff. Couldn't have been any worse than Birthday, say.
We know the 4 from the WA, but he also wrote in those days (at least):
1. Not Guilty (recorded but unreleased until his solo album from 1979 titled "George Harrison", you know it from the Anthology 3 and it sounds very similar).
2. Sour Milk Sea (demo in Esher Demos in may 68, recorded by Jackie Lomax that year with George producing it -a good one that the guys should have used in TWA, IMO).
3. Circles (demo from the same sessions in Esher, mostly instrumental at that moment and was unreleased till his solo album from 1982 titled "Gonne Troppo", no a
great one, indeed).
4. Something (in a very early version at piano at the end of the sessions of WA -inspired by "Something In The Way" of James Taylor, it's said that the same day Paul made an early version of what would become Let It Be).
P.S. I don't like Piggies.