If you use a program like Wallpaper Master or Display Fusion you can set you speed dial to the wallpaper image that program makes, so every time you open Opera it will match the current wallpaper you are using.
The long way to do this is to open the file you want to be your wallpaper and save it as a generic name (Wallpaper.jpg might be good). You now have two copies of the image. Set your desktop to use the generically named image and do the same for your speed dial. Each time you want the wallpaper changed just open the new image you want to use and save as the generically named image. Hope this works for you guys.