Interesting idea Katrina. I did something similar to that in a build I did long ago. I had a 180g tank and did a massive rook slope that went way up the back glass. This was before I started using egg crate platforms, so it was a lot of rock! Also, this was back before we had wavemaker powerheads so random flow was hard to come by.
Well, the return from the sump came over the back glass. Rather than nozzles I made 2 square 'S' shaped pipes that ran down the back glass inside the tank and behind the live rock. I drilled lots of holes the entire length of the pipe starting with small holes near the top and bigger holes at the end along the bottom of the tank. Then I hooked up one of those cheap flow changers that switches the flow back and forth between two out flow pipes.
I think I may have a photo of it. That tank also had a closed loop with Ocean Motion Revolution heads that came in over the top of the tank and the return from the chiller went deep into the tank as well. It was a pvc jungle, but it ran fairly maintenance free and provided lots of good random flow.
The square 'S' shape we called 'spray bars' the pipes over the top of the tank are connected to an Ocean Motion flow diverter. The Revolution heads are not attached to the ends of the 4 overhead pipes yet.
And I'll take back my comment about not using egg crate platforms... there are a couple small ones in here along with a big pvc pipe 'cave'. And not the Revolution heads are now installed on the overhead pipes. There are 4 pipes and you could set the Ocean Motion to run them one at at time, alternate between two and two, or run 3 at a time and rotate which one is shut off. The revolution head would float and when water pressure was applied, it would rotate about 15 degrees ("revolve... thus the name revolutions). So water never sprayed out the same direction 2 times in a row. The head would do a full 360 degrees over about an hour!
You can see kind of where the build was going in this photo.
This was the switch mechanism to make the return from the sump switch back and forth between the two 'spray bars'. It was cheap, ran on flow from the return pump and worked for several years. Eventually I removed it and ran the return to both bar all the time.
This was the entire system in it's prime.
Here is a close up of just the 180g tank.