I found where the images load from in the cache files (I guess this is what cokeman was talking about)
Here's the chip file for example:
I tried just replacing that URL, but as I was expecting it didn't work. When I opened the client it edited the text file back. That's all i'm really capable of doing, maybe someone else can mess with it.
And I've only managed to find the chips and table bg, there are alot of files in cache>data8 to check. Alot of them are for the lobby and stuff (I also found a file with all of the banned chat words, which I didn't expect to see, made me lol).
Anyway I'm pretty doubtful anything is going to work unfortunately. But what do I know, someone may figure it out.