I know there are tons of Photoshop brushes around, but just in case you haven’t seen these two sets, then feel free to download and use. Sizes of these brushes vary by default, around a thousand or more, but you can always adjust not only the size but other settings as well like opacity, flow, etc. Maybe next time I’ll try to discuss how to adjust some Photoshop brush preset settings. But for these brushes, all you need to do is download, extract and drag the brush file to your brush pallete, and start using your new brushes. I’ll try to cover more Photoshop brushes next time. In the meantine, enjoy.
Download: Sci-fi Glow Photoshop Brushes
Download: Rust Photoshop Brushes