All I grew was mold.
The mold did look healthy and it certainly flourished, but it wasn't quite the maple seedling I was hoping for.
Just for reference, because I didn't include it in the original post, this is the picture that I fell in love with:
Hardly a pot full of mold.
I will give it another try, because I love the results so much (so dramatic!). My next attempt, however, will certainly involve a pre-started bonsai.
File this one under Project Fail.
*Image is from Martha Stewart Living, and is certainly not a depiction of my living room