Oddfault is basically the default textures but an amount of them are changed in some way or another.
Here's the link to the texture pack:
https://garbage.loan/f/stevebrine/oddfault.zip
If you want to make a version that fits with the terrain.png your server uses, then here's the terrain.png for Oddfault:
(Extra stuff like the prismarines and the diamond block textures aren't really used, so don't worry about them, unless you're planning to use them.)