I poured the finished liquid into these silicone ice cube trays I found in the dollar section at Target.
One packet of jello filled up 19 of these shapes, but here's a scale picture to show you just how large these were.
The verdict? The kids liked them, and I thought they were pretty good. I like how you could pick any flavor and turn it into a snack. It was also very easy and they set up really quickly. They are a little sticky so I just dusted them with a little corn starch and stuck them in a plastic bag for storage.
However... I'm not sure how cost effective they are. Knox is a bit spendy. You can find Jell-o on sale or buy a generic brand, but I still think I can buy the ready made brand for less. And since these aren't really any healthier than those, I'm not sure I'll make them again. Maybe if I can find a mold that make smaller portions too. You can also buy sugar-free jell-o and make it the exact same way.