For the space I have available, I chose to get two of the 15" GRUNTAL rails from Ikea ($7 each) and some BYGEL S-hooks ($1 for 10 but needed to be pried open a tad to fit on the rod).
I think I'll get one more rod and pack of hooks the next time we're at Ikea as I had to double up a bit and want some room to grow. Even as it is, so far this system looks and works great and is conveniently out of the reach of little hands for now.
There's certainly room for that additional rod below these, and I'm thinking of framing some lace or burlap as an earring organizer to hang on the left side. I'll keep you posted!
I love my IKEA hardware necklace organizer.