Conventional wisdom is that it's good to allow kids to be bored (by which this generally means: not intervening as a parent with an activity) as this will compel them to take action, creatively or otherwise. It just might not be the actions parents expect. You can take away the tv, but that doesn't automatically mean your kid will color or build a fort.

I think "spontaneity" is informed in large part by habit. If you teach a kid to build things, how to draw, read, etc, they might be more inclined to explore this out of their own volition.

I mostly daydreamed. I had crayons and paper, but was not compelled to use them that often. The Legos collected dust after I followed along with the schematics.