Here is an example of a caption contest: http://contest.newyorker.com/CaptionContest.aspx?tab=winner, but what I'm imagining is better compared to asking a child "what do you see when you look at the cloud in the sky?"

Rorschach test background: https://en.wikipedia.org/wiki/Rorschach_test . By mentioning this I'm implying that it's interesting to discover what other people see in abstract objects :).

Great post. Thanks again! I'm going to try it next time I have ginger.