I got red hammer, i think a lot of people are just lying about what they guessed, or they did the test incorrectly.
I believe this test is based on you using the math oriented side of your brain, which is the most logical and uncreative. since the red hammer is the most common response, and if you were really doing the test as you are meant to (no pausing, just thinking of math, trying to do it as fast as possible) then you will most likely get red hammer.
if you are thinking things like pink balloon, thats not a tool, so you fail.