Okay, here are the "result pictures" - more of an interesting experiment than a beautiful ornament, as you can tell:

Here's a close-up, resting on a paper plate from when I brought it inside a few days ago, just set it on that and stuck it in the freezer after I took off the outer balloon:



Then a bit further away from it so you can start to see the odd pattern of the food coloring versus clearer water:



When I went to put it down, I dropped it - hence the mark on the show to the right, then dropped some birdseed on it. The stray red bits of stuff in the snow are actually from the fruit of the tree, not the balloon experiment, by the way.



And from furthest away, you can see the odd almost colorless stripe - note that I could not have done that on purpose if I tried - just squirted some food coloring into the balloon then added tap water all at once.



Not exactly the "easy, pretty decoration" promised by the people who post it on Facebook and the like! And I know it will make a mess as it melts, which is why I set it on the snow, to be able to see the pattern as it spreads ...