1. Open Word.

2. Insert - Picture - Clip Art. Choose your picture and insert it.

3. Right-click the image and go to Edit - Picture.

4. Double-click on the color you want to change and the Format window will appear.

5. Choose your new color.

More info on how to edit Clip Art: http://www.articulate.com/rapid-elearning/what-you-need-to-know-when-working-with-grouped-clip-art/