In a small saucepan, pour gelatin on top of juice. Let sit for about 3 minutes to soften gelatin.
Turn heat on medium and stir gently until gelatin is dissolved. This should take 5-7 minutes. Pour into a small glass pan and place on flat surface in refrigerator until firm (about an hour).
Run knife around edges and slide it out onto a cutting board. Using a knife or very small cookie cutters, cut into desired shapes.
Enjoy immediately or store in fridge.
Notes
Make different flavors by substituting fruit juice of your choice.