Please let me know if this is either in the wrong place or not allowed! But in my venture of modding the game, I had some problems getting assets unpacked to edit and use. The tutorial on the wiki was incorrect, but I managed to figure it out on my own. So! For ease of access, I've zipped most of them into archives for modders to download so it's easier to use and edit. Textures are all .png files with transparency, and I'm working on unpacking other assets as we speak. If anyone has any requests, let me know!
Textures (a16) (https://www.dropbox.com/s/c4gdn718snuwf3k/Rimworld%20Textures%20%5Ba16%5D.zip?dl=0)