I was just being cheeky, 32x32 is a nice sweet spot with enough detail for designs and not too much to get bogged down in too many hours. Hope you find my renditions useful!
No you're right; the claim is it's more common, but besides DCSS there really aren't many resources available for it. For tile based art, it's kind of pointless to go above 32 unless you're using hexagons.