<[ Delph Inc. ]>
I found that if you use black as in '#000000' and make another colour transparant, Graal doesn't make the black transparant for it uses the other colour assigned (yes I'm Australian we say, "colour", not "color").
As for the boxy thing, it is a sort of medieval house and they're usually made of bricks making it square like many houses around now, but I'll take that into consideration.
I'll be making many more houses and tiles so I will make one with wood walls for your liking...well, I haven't really touched the tiles in a few weeks now
</[ Delph Inc. ]>