Whenever I use BG tiles in maps, they are used as 16x16 map tiles. Does anybody know how to use 24x24 map tiles? Is it even possible?

BGSCALE (Layer),1.5,1.5

That could work. That would take the 16x16 and make the width and height 24. However, this is a different situation. The blocks that are highlighted in orange are perfect 24x24 blocks. Is there a way to literally use 24x24 without the use of BGSCALE?