The default wallpaper for Ubuntu 12.04 has been revealed in a bug report.
In it Canonical design team member Otto Greenslade presents two version of the same background: one with added ‘noise’ texture and one without.
‘I would of course prefer to use this one if at all possible,’ writes Otto of the former design, although notes that its larger size may be a blocker to this.
The wallpaper boasts ‘subtile adjustments that follow in line with the previous [wallpapers]’, and a ‘re-balanced’ tone introducing ‘more warmth’.
So if you’re thinking that it looks familiar, it’s because it’s supposed to. Indeed, the each of the wallpapers from Ubuntu 10.04 onwards have retain, largely, the same colour palette and styling with only minor tweaks to lighting having been made.