Golden creeping Jenny, Lysimachia nummularia, is a trailing plant with round or kidney shaped leaves that have that bright chartreuse color I always seem to gravitate toward. The plant forms a dense mat that looks perfect when used as a ground cover or when trailed over the edge of a container.
Creeping Jenny prefers moist areas with shade to partial shade. It will also grow in full sun, but its lime-green color becomes more yellow with increased light exposure. Like its cousin creeping Charlie, once established creeping Jenny can be a bit of a garden thug. I find it is best to plant it where it is free to run wild or in containers where it can be controlled.