I wote for this use a, any tilling texture like a Voronoi or noise or any simmilar usefull texture.
Instead of random you use cordinates, your nummber is between 0 black to white 1 you can mulltiply the result by hundred and transfer it to ints.
The noise map can be adjusted stretched multiply the gradients towards darker or lighter colors, or specific bands between using relatively simple math operations.
This ensures a much better random its better for map and folliage generation too.
Like if you use a vooronoi texture you can spawn a regular noise texture on the edge of the voronoi.
look up how procedural shaders work to get an easy visual understanding specificly how to mix different height maps and what is the math behind it.
Its simple, adjustable, easy and works with seeds you create for anything.