I got this from a good friend of mine in Toronto. Great for getting kids to dig a bit deeper with their questions, or for determining the difference between types of questions and when is an appropriate time to ask a specific type of question. Break it down with students and try and categorize each color. Understand the differences in meaning and usage. Use it as a prompt for a read-aloud (I am looking for some big picture good purple questions) or use to gather information (we need some basic yellow questions for background knowledge before we can proceed forward).
The ultimate goal of this chart is to eventually remove it from the class and have the students ask the right type of question in the right circumstance without prompts. Try it and see if it works.