These are the stock wallpapers bundled with Android 5 ( Lollipop) on the Nexus 7. The resolution is good enough (probably even better) to use them for your desktop PC or lap top, because the Nexus packs a display with resolution of 1920×1200. So each of the eleven wallpapers has a greater resolution than that.
I like the clean, minimalistic look to them and they go along quite well with a Windows 8 OS.
An excellent theme for Windows 7/8. Some of the wallpapers like the one with the tree at sunset in lavender field, the lupines or the dewdrops on crocuses look amazing on desktop. You can get the entire theme here.