I'm sure this is not a new idea and perhaps somebody's already made it, but I was thinking I'd like to see irrigation blocks which 'pressurize' water and keep its flow consistent within like 3 or 4 blocks so it can be moved along flat planes. And also re-direction blocks that make the water, well, redirect. I unfortunately cannot do this, as I have no experience whatsoever with either coding or designing.
Irrigation blocks