Excellent example of how to pair repetition (purple catmint and orange sedge grass in the foreground) with diversity- many of the plants are only used once. To make the onesies fit in, use different plants of the same color.
Fantastical Flower Beds - Need some spring flower bed inspiration? These two inspriational photos are full of tulips. This first one used a complimentary color scheme of blue and yellow, for a more calming and minimal feel. - Flower Beds and Gardens