Horsetail and creeping jenny - very compatible, they both like it wet. This kind of plant combination is fairly easy to maintain because it doesn't need a drain hole in pot, you can fill it with many days worth of water, even in hot weather.
Tiny Winter Forest Plant, water, enjoy: easy-to-create container gardens to brighten every corner of your yard from spring to fall. Create a winter forest in miniature to enjoy all year long by potting low-maintenance dwarf conifers.
Majesty palms makes a gorgeous “thriller” plant in a big outdoor container—with showy Tropic Escape mandevilla and hibiscus surrounding its base. Care tip: Majesty palms like moist soil, but don’t allow them to dry out or sit in water.
radmegan: How to make Molded Concrete Planters - use plastic containers to shape the pots and smaller plastic containers inside larger ones (ideally, leaving about a half an inch of space between the two.