I think that using color is a good idea, and I experimented with it with some of my beginning students who were struggling to read music. I created my own color code and created a piano chart for my students. Then as either a theory assignment or as part of our lesson, I would have my students color the notes the appropriate colors. For example, they would color all of the Cs pink, and all of the Gs green. Because my students were the ones to color the notes, this reinforced the note-reading for them. One of my students told me that she loved how pretty her book looked after she colored the notes. In this manner, color coding can be compatible with any piano method.
I have created several manipulatives that I will be sharing soon that use the same color-coding as the following pdf. If you are already using a different color-system, and you want to use the games that I will be sharing, I would advise changing the colors in photoshop to match what you are already using. There is no scientific reason why I had C be pink and G be green, I just experimented with colors and thought that this combination had good color contrast. It looked pretty to me. :o)
Here are the piano charts that I made for my students. I recommend printing on cardstock, laminating if desired, then cutting them out and taping them together to make a strip that can be slid behind the keys.
In B&W (can be used just to teach letter names, or could be colored with crayons or colored pencils to save your ink)
Please note: I am not a graphic artist. The black lines for the black keys on the piano do not line up exactly when you place the chart on the piano. This was slightly frustrating for my younger students. I’m sorry! I am good at coming up with ideas for teaching, but recreating them on the computer is hard for me and so some of the print-outs are not perfect in that respect. My husband is going to teach me how to use adobe illustrator soon…