Navigate to the 'Adium 2.0' folder in finder then search for image file types like jpg or png, that should bring up results that you can use their paths to the folder.
.......I can't remember when but i do remember that when someday i -trashed i think- Adium i say all these in the Trash.... But i don't think trashing is a good option.
Your contact's icon image right?
These?
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Searching;
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I'm not quite sure what you're saying about deleting adium, but you should be able to find these without having to delete the program.
I've found the images (with garbled names) at: ~/Library/Caches/Adium/Default/