This is my personal view on your last question (writing on phone we'll see if it assists me in some of the text).

To me it is about emergence.

You have some sort of non-predictable input and rules to interpret/constrain it.

The input can be ununiform random like random.value or random.range, or it can be pseudo random like perlin noise.

It can also be player input, most recent tweets, time of day.

Or many other things and maths transformations of these or combinations.

The rules will of course depend on what tickles your imagination. In the simplest forms they are schema in which you select content from some database. But maybe they are distributed like cellular automata, boids or maybe they have a memory and build up a bias for certain outcomes over time.

So this might not have been helpful, but in principle I'm trying in a very convoluted way to answer yes!

There's nothing much mystic about it all. Just letting go and see what comes out .

As an example, I'm trying to make a poet that will write song lyrics based on a word graph I constructed from 10k songs and some ad hoc rules so it will rhyme and such.

That's pretty much up to you! Writing out arrays of words directly into your source file is the least difficult thing to do, but it's also not very flexible. Creating and then reading from .json files is only barely more difficult, at least in python.

If you have a file like birds_north_america.json, you could load its list of birds in python 2.7 with the following:

import json

#assumes birds_north_america.json is in the same directory as your script
bird_json = json.load(open("birds_north_america.json))

#this will print "Birds of North America, grouped by family"
print(bird_json["description"])

#this gets the list of bird families
families = bird_json["birds"]

#this gets the first bird family from the list
ducks = birds[0]

#this prints the first member of the duck/geese/swam family
#which is "Black-bellied Whistling-Duck".
print(ducks["members"][0])

I was thinking no "chance of attack" - if there is an attack in that time in pattern, it happens.

So, something like - choose randomly the duration of pattern, add attacks at random times in this pattern;s duration. Then check that there is no attacks too close to each other, and there is right amount of gaps wide enough that player can squeeze his attack. At lower difficulties you will want more, wider gaps and vice versa.

You make several patterns for a monster like that and don't change them afterwards - all randomness after that is how patterns chain together.