I read this about yellow:
Like the energy of a bright sunny day, yellow brings clarity and
awareness. The shade of yellow determines its effect: Yellow-green can
mean deceit, and creates a disoriented feeling. Orange-yellow imparts a
sense of establishment. Clean light yellow clears the mind, making it
active and alert.
So when the paint becomes as muddy as my thoughts, there is only one thing to do—paint a lemon.