In the last blog I asked which was the best colour scheme. I had some great feedback from friends, mostly that the first image, (terracotta rocks on a blue background) was great, as well as the original grey rocks on dark blue. I assume these work best because they're high contrast to each other.
I also really liked the red on dark grey, so might keep that for an alternative, maybe in some special levels.
Anyway, here's a video I made to see how the game would look with a grid on the background.
I've actually since decided against the grid, in favour of the triangles.