To edit the animations you:
1)Open the tileset sarc file in a hex editor
2)Ctrl + F and search for "CTPK"
3)A couple lines below "CTPK" you should see "xxx.tga" Find the one with the name of the animation you want to edit
4)Once you have found the one you want to edit, copy all data from CTPK to the last "..........ÿÿ...." (Usually just before another "CTPK" or some other random data)
5)Create a new file in your hex editor and paste the data you just copied, Save this file with the same name as the "xxx.tga" with the extension changed to ".ctpk"
6)Use ctpkTool to extract the ctpk and get the png image file
7)edit the png
8)use ctpkTool to repack the ctpk
9)Open your modified ctpk in your hex editor, copy all the data and paste it over the data you originally copied from the sarc
10)save the tileset and use it

Yes and no.
Each background uses the "Model/Distant_View/dv_noise.bctex" as the texture for the background. It is a grey scale texture that is tinted depending on the background in use.
I am unsure how the game tints this file for individual backgrounds, so the only way to adjust it is to change the base color of the file itself, though this will affect all backgrounds in the game.