If you ultimately decide to go with a black and white photo, then it is best to use cooler colors as a background, such as blue. Warmer colors tend to make black and white pictures look somewhat dingy, so yellow creates a dirty look. Blues make black and white photos look crisp and clean. When you combine all these tips, you will create beautiful photo birth announcements that no one will ever want to throw away.
While you do not want to create monochromatic photo birth announcements, it is still a good idea to use colors from your photo and incorporate these accents into your announcement. These accent colors can tie the whole thing together, and give your announcements a professional feel. The way to make this successful is to choose an accent color, rather than a dominant color that will wash everything out.