One container planting idea for a small space is to build a privacy wall for a tiny terrace with a shelf and enough space at the top for a collection of plants in small pots and terraria. A small patio is ideal for a few pots full of miniature roses.
The patio needs to get at least six hours of sun a day, and consider adding a small-leafed, small-flowered creeping plant.
You can grow a trough full of strawberries in a sunny window. The red fruit that overhangs the edge of the trough contrasts with the green leaves. You can also group galvanized tubs of several shapes and sizes together to grow herbs, fruits and vegetables.