My fourth "creation" is a Lego color palette I use to help me discern the many varying lego colors.
This isn't a MOC, really, but it was something I desperately needed. My first palette used simply scraps of paper squeezed under the bricks as labels. But the paper faded away, wrinkled and worn. This palette is more permanent.
I had to purchase a lot of "Name Key Chains" to get all the letters needed. And I have tons extra. But I will use them in future MOCs as lables or title plates.