A bright green planet, the entire mass of the planet is covered in plant-life. Even its most intelligent creatures are plant, at least partly.
Living on the planet Namek are of course, the [Namekians], but also a diverse range of other life. There are Dino Munkies, huge green apes that are covered in moss and lichen. Then, there are also Gremlins, tiny green fur balls that run around causing trouble to the more intelligent creatures.
Namek is mostly ocean. Green ocean at that, making the safety of swimming through it, or even drinking it, questionable. The little land mass that there is on Namek is covered in a plant that the Namekians revere as nearly sacred, as it is the most beautiful thing on their homeworld.