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SprayMesh

Now your server's players can have sprays again! And BETTER!
If you didn't know, having sv_allowupload and sv_allowdownload on are security holes. Malicious players can gain access to any custom files you have, such as your server.cfg, and can even upload things to your server.
So, if you haven't already, you should set these to 0. This breaks default gmod sprays!

This addon replaces default sprays with a safe version. You should still set the two server convars to 0.
This addon lets your players easily use URLs for images. It creates a map-conforming mesh to display the sprays on. This does not hurt anyone's framerate (with special options for really bad PCs). This supports videos, such as webm, gifv, and even youtube URLs (which are muted).

All you have to do is add this workshop item to your server, or subscribe if you're a user wanting this for singleplayer.
This overrides the spray bind to create a SprayMesh, and informs users how to use it!

http://facepunch.com/showthread.php?t=1451605

Update (August 2016): At this time, Imgur is converting all videos to mp4 instead of webm (masked by the "gifv" extension). The Source engine won't let me use MP4 videos for sprays. The workaround is to download the video off imgur, then go to gfycat.com to upload it. Gfycat will make you a webm URL to use with this mod.