Determine the purpose of your plants. 
Different plants
can do different things for you. If you mainly want to brighten a space, you'll
probably want a flowering plant or one with colorful, variegated leaves. If
you're looking to remove as much carbon dioxide--or add as much oxygen--as
possible, you should look for a green plant with a lot of leaf area. 
Certain
plants, such as the Areca palm, Kentia palm or Dracaena 'Janet Craig' are
exceptionally effective at removing airborne chemicals commonly found in offices.
Here's a short list of some
commonly successful office plants to consider:
- Ivy
 - Philodendron
 - Peace lillies
 - Spider plants
 - Aloe vera
 - Aroid palm
 - Wave petunias
 - Dragon trees
 - Crotons
 

