Now that I look back at this thread, the monoliths seem...
Similar.
I was watching some videos from older Terraria videos and noticed how much better the sky coloration was. I know that Re-Logic probably won't bring them back. But in a way it is still somewhat possible. The Air Conditioner! It acts much like the water fountain in a sense that It changes a certain aspect within a certain range of blocks. The air conditioner itself is a single item. You need to create types of "Smog" That are colored.
The inner blue area is where the "Colored Smog" Goes. The color you use will change the blue in the sprite to the color of the "Smog" You use.
"Smog" Isn't the term I want to be used. If anything better can be thought of- please tell me.
This item can be obtained from the Merchant after you have destroyed two hardmode mechs. It's price will be 3 gold. The "Smog" Can be created by combining dye with an "Empty Smog Mixture" At a Heavy Duty Workbench.
Here is a Blue "Smog". It changes the sky the color blue, the blue used in the normal areas at that.
Here is Red "Smog". It changes the sky the color red, the red used in the original blood moon at that.
Here is Orange "Smog". The sky would turn to that of the corruption from 1.0.6, I want this one the most personally.
Here is Green "Smog". The sky will turn into a fine shade of lime green, perfect for all you bubble up fans out there!
Here is Purple "Smog". The sky will become a fine shade of purple, great for anyone who lives in the edgezone.
Here is Midnight "Smog". It turns the sky to a nice dark blue that fades to black at the top. Great for sleep.
Here is Rainbow "Smog". The sky will become a rainbow gradient! Need I explain more?
Here is Silver "Smog". This will fill the sky with fog. Perfect for modern building designers!
Here is Shadow "Smog". The sky turns into a shade of dark purple that fades to black at the bottom. Cool, right?
Here is Martian "Smog". The sky turns to the color of Mars' sky. Perfect for ancient aliens!
Here is Pink "Smog". The sky turns to a candy-lover's guilty pleasure. Perfect for people who live in the hallow.
Here is Yellow "Smog". The sky turns yellow, and you start to get mellow. Perfect for Lemons!
Here is Light Blue "Smog". The sky becomes the color Sky-Blue. Perfect for normal human-beings!
So yeah, I refined it a little to make a bit more sense.
Let's hope this gets in the game!