How can we increase the window transparency in Yosemite?

This has been discussed a little bit on Reddit as far as I've found so far.. http://www.reddit.com/r/osx/comments/2jnxll/is_there_any_way_to_increase_translu cency_in/

It'd be cool to have a system-wide/global control for window transparency, or even better would be per app, but that seems like it'd be a bit more complicated..

Any thoughts/ideas as to how to make this happen would be much appreciated!

Thanks