There's this really cute skull splat I keep seeing everywhere; I think it's some clothing company icon or whatever.
Anyway here is my imitation! I got ArtRage with my tablet which is actually pretty cool, it complements the GIMP nicely. It has different brush textures and when you use the paintbrush, the default option is for it to mix with the paint already present. I imagine for Real Artists Who Can Paint it's super good, for me it's still fun! You can turn anything into a stencil so I have this skull as a stencil now, that's how I made the dropshadow. All the green was added in the GIMP.