To add colors:

make sure the name uses dashes between words. sample name  paint-color-name.png
make sure the image file is same size and orientation as other images. 250px X 100px

put the image into the respective folder of paint colors.
hok for House of Color
ppg/solid for PPG Solids
ppg/metallic for PPG Metallics

The include will grab the image and it's name, and format if for the page. No need to open include files or add any color names etc.

I will build a function to sync these images to the paint images in nextfit at the shop so they always match.