The four rows on top are (roughly, to avoid overanalysis of RGB values) the color schemes of four logos, letter by letter, with larger boxes representing capital letters:
- eBay
- Gawker
- Stride Rite
- Cinnamon Toast Crunch
Transfer the letters to the rows on the bottom. There are a few repeated boxes, but it should be fairly straightforward to figure out what goes where to make the message: CONTAIN MANHUNT -- GRAY DRAB IS CORRECT! WE SEEK IT. Thus, the answer is
GRAY DRAB.