I've no idea if this is "grunge" or not, as I'm not too sure what you are supposed to do....but here is my version for "Gothic Arches" where it's this weeks theme. I hope you like it anyway ! (The background is a mix of inks and gesso and the stamps are Paper Artsy.
Edit....I've been looking at all the other entries(which are amazing!)and I'm relieved to find out I sort of got it right...!