I've just added the following two halftone items to Patterns-Standard:
I made it like the other gradients, where color1 and color2 fade into each other. If you don't want that and instead prefer a solid color background, you can set color2 to 0% alpha (color1 is solid). Or you can make both invisible and be left with just the dot line art.
do you remember that old Peanuts cartoon where Linus was doing his homework, a map with a key, and said to someone–“Stand back! I’m going to make a desert?” You just reminded me of that! It was one of the best laughs that comic strip ever gave me.