This Heuchera 'Persian Carpet' shines in the shade. I have had problems with some Heucheras bogging down in the heat and humidity, but not this one. What color would you call it ?
Lamiastrum (Galeobdolon) variegatum 'Herman's Pride' is much, much tamer than the species, and the new leaves really are as silver as those in this picture from my garden.
Houseplants often display tropical colors , and this little Calathea is no exception.
Phormium tenax purpureum displays both color and strong form in the garden. Phormiums are the New Zealand equivalent of Yuccas, though they're generally larger and showier, but not so hardy.