COLOURlovers.com is a great web site where designers can share colors, palettes, and patterns, and discuss the latest trends in graphic design.
This article has some great examples of using color in business cards. They offer great tips such as creating a palette from corporate web site design and using designs that may it easy to find the information on the card.
If you need help with your business card design or are looking for a printer that can make your business look the best that it can - give Wilson Printing a call! We've been printing business cards, letterhead, envelopes and company brochures for over 35 years.