A modern take on a poster* for the colors in Spanish. The word is written out in Spanish in that specific color.
This way students do not translate the word "red" into "rojo" or vice versa. They see the word "rojo" out in the color red and make that association.
*There are 2 posters included: one that uses the word "café" and the other that uses "marrón." (both mean brown). I also recently learned that some countries use the word "naranja" for the color orange as well as the fruit, so if you need that one, let me know. I'll upload it.