Feel free to contact me to suggest a resource.
Color Contrast Grid by EightShapes
This online tool tests if the color combos are compliant with WCAG 2.0 minimum contrast. I like using it to test color combinations for buttons and text colors on different background colors.
Web Accessibility Guidelines: Carnegie Museums
The Carnegie Museums of Pittsburgh have published and shared their Web Accessibility Guidelines that include best practices and resources - a good way to learn from Accessibility professionals to make our designs more accessible!