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Whish is the wallpaper? The home icon (logotype of FreeBSD) where download?
FreeBSD icon was found somewhere on the web…
Wallpaper is an edited version of one of the GNOME 3.16 (or 3.14) default wallpapers pack,
Inscription at the bottom left says "Om Namah Shivaya" on Sanskrit.
By the way, now I use the same desktop as ~6 months ago —
A volume indicator — is an audio/osdmixer, you can easily customize its source code to satisfy your needs.
As a desktop handler & file manager I use x11-fm/pcmanfm, it is the most stable GUI FM for FreeBSD IMO.