I have been able to generate 2D land and water procedurally, an example can be seen here: https://i.imgur.com/PsC87mA.png. The issue is that that water and land color are flat, one color. I would like to add some noise or texture to the color to make it look more realistic. What is the best way to do this?
Adding texture/noise to 2D sprite for water and grass
You could hold a copy of the noise you generated it with and multiply that over it. For an example.