Need SArtFile and Extras files

Hi,
I'm fairly new to Mac's and currently have a new Macbook Pro. I tried to install a theme that messed up the buttons in finder.



As you can see there is no icons in the buttons.

It's not a huge thing but it's a nuisance and I'd like to fix it. Foolishly I forgot to back up the SArtFile and Extras files like the theme creator told me to and would like to know how to get these back as I'm pretty sure they are the button icons.

Would someone please help me with this issue.

Thanks, Harry.

Oops link to what the buttons look like didn't work.

See if this is any better.

Screenshot2010-07-24at101904PM.png picture by harry_S_08 - Photobucket