Taking inspiration from a phrase "Jeremy the Painter" used - "Bulk Hot" - which I very much like the vocal performace of - I have a series of "Bulk" terms I am using in the landscape.
"Bulk Green" I use to describe a situation where I am trying to shape or contour a space with plant "bulk." Since I am only forming space, "bulk green" must be very inexpensive to attain "bulk."
Here I'm using 25 Salix 'Flame.' #3 containers retail for about $20 each.
Also good "Bulk Green" plants:
Spiraea x VanHoutteii
Landscape designer and Proprietor of Buffalo Horticulture