Thanks, Becky. I like the look of the 4x8x16.
And probably 8" tall is as large as I should go. The stablest configuration is probably stepping each block back "into" the slope, rather than tilting them a few degrees.
I'v e been thinking I should use a masonry or concrete wheel on an angle grinder to cut pavers (or cinder blocks) cleanly to get angled corners or the right length. But I haven't tried that yet. Do you have a preferred method for cutting blocks to size or on an angle?