Yes that certainly is possible.
Step 1:
Go here
Code:
C:\<map>\<map>\League of Legends\rads\projects\lol_game_client\filearchives
Step 2: Browse in the version - and find the "Map" folders. Focus on
Code:
0.0.0.43; 0.0.0.25; 0.0.0.40; 0.0.0.36 and 0.0.0.37
in
that order (they are sorted from biggest to smallest map),
Step 3:
Mess around! Try to replace the files with an empty file - so if you have AwesomeLolGraphics.xyz rename that to AwesomeLolGraphics.xyz.bak (backup) and create an empty file named AwesomeLolGraphics.xyz (the same as the original).
Step 4: Now log in, and check out the effect.
Optional, tho highly recommended:
Step5: Post your results in a topic over here on Epvp, and
share what you've found!
Edit:
Code:
C:\<map>\<map>\League of Legends\rads\projects\lol_game_client\filearchives\0.0.0.43\Archive_14198048.raf.dat
I've replaced this file with a dummy - and that crashes LoL. That means, you need some sort of access to the file, to see what is necessary to run a game and what is fancy-textures (to take out the latter). There are some tools to view unknown archive's but that is Reverse-engineering stuff, you'd have to dig in by yourself.