There's two streams that are good for that, post_for_points and unsubmitted-images. The idea is that you have an infinite amount of submissions in each stream (you can post as much as you want). A good strategy would be to spam images in post_for_points (you don't have to put any text just image after image), and then scroll through unsubmitted-images and upvote everything you see. Once you hit 1000 points, you can ease off on the thrusters a bit, but it's a good place to kick off from.
