Another great perk is that it is inexpensive if you gather it from your yard. Greenery is long lasting as well.
Hosta leaves are very broad so they are great for collaring and coverage.
Here are several greens together. Variegated hosta and pittosporum are completely different textures but similar colors. The purple is a great touch to bring a pop of color and the grass brings the whimsy.
The whole look along with colored water. Instead of using flower buds in the small vases just use some greenery to bring the "color" down to the table.
Simple elegance is the best description for this look. If you are short on time or just forgot the flowers, use some beautiful greens to complete your party theme.