[Azhrialilu]

Of course, this is possible - no plug ins or file mods required.

At the very bottom of your "all style options" page for each style (where you input the css values, etc) you'll see a box titled "Replacements Variables". Click "Add new replacement variable", select the style you want different images to show in. In the Search for Text box type in the original url, eg /images/icons and in the Replace with Text box type in the new url to the images, for example /newstyle/images/icons

You can do this with smilies too. Get stuck, give me a yell. Over on GFXStyles, we do this by default on all our styles.

One more thing, if you're going to do this for smilies, you must ensure that your replacement images are saved with the same file names as the defaults.