This is a simple PowerPoint I use when teaching the French colors. Each slide has a grey background with the French term in the indicated color (vert is in green, rose in pink, etc).
This can also be used with in-class activities. I do a quick review activity with my classes where I say a color in French and give them a few seconds to identify something in that color around the room. When the time is up, I have students list a few objects, then show the correct slide to the class.