A perennial that has round rusty red leaves, creeping red sedum sports bright red flowers in a star-like shape from June to September. Sedum is hardy in U. hardiness zones I'm never sure if this includes south Louisiana or not.
Garden Flowers in a Glass Compote - Spring Centerpieces! Brilliant violet Muscari latifolium and tight blooms of Ranunculus get a boost in a lush, dense display. The flowers look equally fetching in a smaller-scale display.