Right now if you use a clickable picture, the user gets instantaneous feedback if they were right or wrong. Their click shows up as a green check or yellow X on their device. Also, if I want to reveal the clicks on the presenter screens as they are coming in, so the audience can see what everyone is clicking on, it will show which clicks are correct or not. I would like the clicks markers to all be the same (possibly blue) then when the timer runs out, I can reveal who was correct and who was incorrect and have the "in-box" clicks turn green and the "out of box" clicks turn red or yellow.

Example of application: I give medical lectures and show medical images like X-rays. Students are asked to click on the abnormality they perceive. I want to see the different answers as they come in so we can discuss the different findings that students perceive, and it is important to have this discussion before they know which one is correct.