Wrapping some elastics around a hard brayer, rolling it into paint and then painting directly onto your support can yield some energetic lines.
What happens, though, when you use a soft foam paint roller and do the same thing?
Here I'm priming the roller with paint for use on my first surface
You'll note that using different brayers (foam, soft, hard), altered sizes of elastics and varying your pressure when applying will give you a wide range of effects with this technique. It's clearly time to get those elastics working for you.