Also, if you have a progression that includes a G7sus chord, you can throw a DQ chord.

G7sus=[G,C,D,F]
DQ=[D,G,C,F]

By the way when I say "DQ" I`m not talking about Dairy Queen.
And if you wanna writte a "B flat quartal" would you say BbQ.
I think I`m hungry.