Add entire bottle of school glue to a bowl.
Mix in 1 1/2 tsp baking soda.
Add food coloring until you get the color you want.
Then mix in 3/4 tsp saline solution. The slime should start to pull away from the edges of the bowl and form a ball.
Use your hands to knead the slime. If it's still feeling sticky, you can add about 1/4 tsp more saline solution and need until it no longer feels sticky.
Cut the felt into a leaf shape.
Use hot glue to attach the leaf shape and the cork to the mason jar lid.
Decorate by adding a piece of raffia around your cork and trim with scissors.