DeviantArt remains the largest free resource for digital brushes. Use the site’s search filter for “resources” and “Photoshop brushes.” Several users have uploaded “Grut-inspired 500 brush sets.” Important: look for files uploaded by established members (5+ years, high faves) and always scan the .ZIP file with VirusTotal.
To get the most out of your GrutBrushes art brushes, here are some tips and tricks to keep in mind: grutbrushes art brushes 500 free download