Trinity using 3 transparent pieces of plastic sheets
Anyway, my idea, though still not a perfect representation of the Trinity, is to have 3 transparent pieces of plastic sheets. Have the kids cut them into equal sized circles about 5 inches in diameter. Use colors where you can see through them if you stack them up. Like the fruit punch example, you can use Yellow, Red, and Clear. That would end up making Orange if you stacked them up.
For Yellow, take a black permanent marker and write Father. Red, write Son. Clear, write, Holy Spirit (Ghost). Write them all on the edges of the circles, not the center. Then, in the center of the circle, in all capital letters, write GOD. Write GOD for all circles. Then, stack up the circles, so that GOD overlaps all of them in the same spot. So if you held up the stack up to the light, you will see GOD clearly, but you will also see Father, Son, and Holy Spirit on the edges. Then, punch a hole at the top, and take one of those gold "T" shaped fasteners, and fasten them together.
Here are the connections to the Trinity:
The 3 distinct persons are all "Connected" and "Inseparable" (with the gold fastener).
They are all GOD. They are not a part of GOD, they are all GOD themselves.
They are all distinct.
It's a lot of craft work and I don't know how well it will work. Just an idea.