Question: with pacaq and Chessmonk having good looking vectorial boards... do we really need joshua to put his time in another board. I would rather put his creativity in the logo/icon, improving the look&feel of the mockups.

If the square highlighting (or the arrows, whatever we do now) can be also borrowed from these apps I would do just that. Or the movement animations. Let's concentrate the work in whatever doesn't exist and needs to be done.