Ah, more material.

I now have another book of piano music I can play, when practicing chords. This is right at my level, at this point: the first several pieces are all in C Major, with the right hand doing mostly just the melody, and the left hand doing chords, mostly chords with which I am already familiar. (This is not a coincidence; the book was designed to go with the piano course book I am using.)

These are fun to play, because I can actually play them, but they do stretch me a little at this point, and the practice is good.