Rose of Sharon bushes/trees seem to grow well alost anywhere, they come in a several colors as well.
Irises, those will grow pretty much anywhere as well, are come in tons of colors and styles and smell good...they don't have to be planted very deep, so you could even plain Daffadil or tulip bulbs first, layer with dirt over them and them lightly cover some Iris bulbs.
I love wave petunia's in containers and sweet potato vine in containers too...they cascade and spread fast....they are really pretty.
A wildflower mix thrown in a flower bed or in "empty" spaces really makes it pretty....especially those mixes w/ bachelor buttons, wild poppies, etc.
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