'Super Silver' is one of the nicest Hoyas around, in our humble opinion!  Its silvery leaves look like they've been given a sheen of metallic paint, and the color is consistent and reliable over time.  An easy Hoya to grow, this one likes moderate moisture and blooms best when its pot is a little snug.  While it will grow fine with lower light levels, a bright spot out of direct sun but well-lit most of the day will help keep up the very nicest silver variegation.