Ignore all these words and go here for a version that works.

Updated cause Parallax thingies happene
Grab the new pdmod file if you want to have the new parallax stuff in your long lasting bullet holes.

All the mess, all the time
Do you hate the magic cleaning fairies who crash your party, removing blood stains, bullet holes and other such mess? Fear no more! My messy package can help!

As you might guess, this mod makes all the bullet holes, blood and other textures (up to a limit) from killing things stay in the world much longer (currently 10 minutes) before vanishing. The piles of bodies you see in screenshots and the video are made possible by GoonHUD.

Downloads
Dropbox (original)

Some of you requested a version that keeps the mess around for half as long, and keps half as much of it around. This is now available here (5 minutes of mess)

Refer to the offical modding thread for installation instructions of a .pdmod file.

Screens and Video
https://steamcommunity.com/sharedfiles/filedetails/?id=288623024
https://steamcommunity.com/sharedfiles/filedetails/?id=288875335
https://steamcommunity.com/sharedfiles/filedetails/?id=288622979
https://steamcommunity.com/sharedfiles/filedetails/?id=288417641
https://steamcommunity.com/sharedfiles/filedetails/?id=288622960
https://steamcommunity.com/sharedfiles/filedetails/?id=288622938

No mod post is complete without a video demonstration. Note, in the video I am using HoxHud and GoonHud as well as the Messy Package.
https://www.youtube.com/watch?v=OFD6qpKwcpE

I hope to be able to add more to this mod in future, like the ability to set levels of gore and mess and their longevity. For now, though, this will do.