What do you have in mind for the style and theme of the business card?
Our colors are Burgandy and Grey essentially. We do have blue and green in our logo which I like because it brightens it up a bit. We also use white and black as need for contrasting or outlines. I like clean and crisp, however I don't want something that looks bland. People tell me all the time how much the like our logo, name and/or website, so I'd like the card to give that same impression up exchange. Where they really look at it and say, "Wow! I really like your card." I would like to it give out the professional and highend feel that our service shows.
Some ideas would be to incorporate some part of a landscape design onto the card that fades out. Could be a colorful design or simply grey/black pen.
Other consideration, making the entire back a logo.