My favorite color scheme is monochromatic. For example, a drift of white flowers, among a drift of yellow flowers, among a drift of pink flowers, and so on. The same color in each drift seems to "hold the drift together".
I am a zinnia hobbyist, so I have every color at my disposal except blue. But I am also an amateur zinnia breeder, so I mainly grow my zinnias in rectangular beds, each bed of which has the same breeder zinnia parent, or the same type of breeder parent. So I don't have the luxury of doing much of my creative landscaping at the present time.
ZM