Everywhere, hanging baskets, urns and window boxes drip with the trailing tresses of chartreuse sweet potato vine. Golden sweet potato vine can also be coaxed up a trellis. Occasional ties will help support the heavy stems and keep them attached during rainstorms. Canna 'Bengal Tiger' has chartreuse by the tail. Be brave, for the flowers are screaming orange.
Chartreuse serves as a good shade-brightener, without being abrasive.
Try 'August Moon'. Cover the shaded ground plane with Lamium maculatum 'Beedham's White', a chartreuse-leaved creeper with white flowers and a bright white stripe down the center of each leaf. Stark contrast is not easy in shade, but Cimicifuga 'Hillside Black Beauty' provides a venue, if that sort of thing appeals. Mix it with any or all of the chartreuse-leaved plants mentioned above, then sprinkle liberally with Ajuga 'Chocolate Chip' for a shade recipe that's sure to be copied by other gardeners. Geranium 'Ann Folkard' is a case in point.