Last night before sleeping, suddenly I realised a fact that I should start to collect tilesets with smaller size other than 48x48. By simply copying and pasting 32x32 tiles to my current MZ's 48x48 tilesets, I've just got smaller flowers, plates, or tables without editting. How come didn't I think of this before!
An example of Mack style sprites: http://cocodoco.chu.jp/material/chara2/chara2.html