Do you use a set of high frequency words that you call "Rainbow Words"? If so, I have made these cute half page certificates (files are 8.5"x11" with 2 certificates per page) to help students celebrate as they pass each color.
Purple / Violet (both are included)
Please see the thumbnail. All certificates look the same, with a different color word where it says "I passed my ____ rainbow words!" I personally print them on the coordinating color construction paper or card stock.