I just put the last touches on this project before it cures. It's a lot of fun! There's a lot of prep work. You really want to have the resin well-mixed. Don't slack on it! My experience is the beginning of beginner, so I'm no expert at mixing colors. But I was still able to mix some strong primary colors with some deeper shades with the black. Might want to let your color sit for a bit before adding the next. I know it's meant to be marbled, but if both colors are really wet it can look really muddled and messy.
I took some time to burn a design on to the bottom of the board; I plan to use it entirely for decoration and hang it. So if you got the woodburning kit or you already have it, it could be a nice combination.