Those cream, white and pink patches have little or no chlorophyll, the green pigment plants use to turn light into energy. That's why variegated plants:

  • need brighter light than their all-green relatives,
  • usually grow more slowly,
  • and can "revert" in a dim spot, putting out plain green leaves to catch more light.

If a stem comes in solid green, you can trim it back to the last variegated leaf to keep the pattern going.