Try to highlight the icon you want to move and press the Menu key and select Move. You should be able to move the icon to the desired location. Drag the icon to the top row and press in the trackball to complete the move. Repeat this process until you have all of your icons in the order you like. You may notice there are some applications that you won't be using. These icons can be hidden so they don't get in your way, however the applications will still be installed so you can use them if you need to. To hide an icon, highlight it, press the Menu key and select Hide. The icon disappears from the screen. In order to get it back, simply press the Menu key and select Show All. Your hidden icons will appear faded. From here, you can run the application by clicking on the icon or Unhide the icon if you wish to bring it back to the homescreen. To unhide the icon, highlight it, press the Menu key and select Hide (notice Hide has a checkmark next to it to indicate the icon is hidden). This will bring the icon back to view. Press Menu and select Show All again to return to the normal view. Hope this helps!
Your answer does not "answer" the question what so ever. The person is asking if they can change their icons to the original style even though the theme/wallpaper changed on the phone. The person does not like the new icons.
The icons are tied to the theme/wallpaper. You would either have to change the theme/wallpaper again on your phone or go the more difficult route and build a theme/wallpaper and choose the icons you liked.