Per Castra Ad Astra (Wallpack)

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This collection consists of 12 Original wallpapers, 39 Alternate edits and 15 Odious edits. As well as the aforementioned wallpapers, it also includes 66 icons with 7 variations for a total of 462 icons. (Windows/Mac versions available here)
There is also a whole Visual Style collection by Jamie Green over on DeviantArt.
In addition to the digital elements, some of the artworks are also available as device skins and covers over at DecalGirl and prints over at Curioos.
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