I cut out colored paper and glued it to the bottom.
Next a gathered all the different colored bottle caps I could find.
And I let the children sort!
As the year progresses I will change out the paper in the bottom. First I will have an all white background with just the words of the colors (red, blue, orange, etc.). Next, I will swap it out for the Spanish version. Simple, cheap and lots of fun! What more could you ask for???