Given enough time to play with them, I'm coming to adore the new Mapnik image compositing features available in Tilemill. I'll cover some methods in more detail in the next few days, but for now here's a look at a series of map background textures, composited through geographic features. The vignettes below are displayed with their attendant carto parameters for your re-creative enjoyment. Click here to see the full set.
Many thanks to AJ Ashton for fiddling assistance and to Dane Springmeyer (+Artem & the Mapnik crew) for hacking the new features. [Mostly] seamless texture tiles generously provided by Dave McNally and Patrick Hoesly.
More compositing to follow . . .