cast concrete planters with colorful plantings to add interest and why not sansevera? It's CA!
How to Build a half-wall planter box, very cool! no bending to reach plants, no weeds, and can act as a wall or barrier, love it! i am imagining it with purple wave petunias or lobelia cascading down the sides ...
VERONE RUSTIC PLANTER $63 These might be too "rustic" for you. I know you like modern, but...
37 Modern Planters To Make Your Outdoors Stylish | DigsDigs
Vintage Zinc Barrel in Gardening PLANTERS Outdoor Planters Large at Terrain