The guitar wallpaper here is a very nice picture of an acoustic guitar with steel strings and a Christian gold cross with a chain placed on top of the guitar strings.
The view is of the saddle and bridge of the acoustic guitar and we see the bridge pins and strings running across the wallpaper. The Christian cross is placed between the bridge and soundhole of the acoustic guitar. But the soundhole here is not in view.
Otherwise I think this is a very nice wallpaper with the cross placed on top. The dark wood finish on the guitar really makes the gold cross stand out. And the reflection of the cross and guitar strings in the guitar body makes it look really good.
This guitar wallpaper is a big one. The size is 2560x1600. It's not a widescreen wallpaper but it's so big that I don't think that it's really a problem for you that are running widescreen computer monitors.