When designing a piece that has alot of corporate sponsors (different logos) I find that it is best to colorize them all the same color so that no one gets more attention than any other company (black & white or grey scale is safe). The sample below illustrates my message. This is a vinyl banner that I created for my client. You see all the logos on the bottom of the poster? Which logo catches your eye first? Well, as long as you are not color blind the Salice logo is the first thing that I see. In fact, it doesn't help the readability of the sign.
I should have made all these logos green to tie into the design but remember that there are some companies that don't allow you to edit the colors of their logo. Black & white logos would of been a safer choice. Always check first if you are going to edit someone's logo!
Here is a better sample for a local association from SE Portland, OR. They wanted to create a walking map that pointed out various businesses within the community. My suggestion was to color code the different services and then if the business supplied the logo I created them black & white (or grey scale). You will see these logos following their names below.