Yes! The fun part is how fascinatingly unique each person is, which can sometimes be highlighted by standard tasks, but certainly isn't limited to them.
And to the question of item tryout: these tests are actually pretty rigorously designed. The point of all the nonstandard responses we've been discussing (that might or might not be formally credited), is that highly nonstandard children generated them. The test is just one tool for understanding the child, which is why good evaluators always interpret the test results in the light of the whole child. (Which is also why, btw, for all that I can contribute some of my thoughts on test interpretation, anything I present is just an hypothesis to be tested against what is known about the child IRL.)
