Manifest — A 5K Periodical by Pictogram

Manifest — a project of Sebastiaan de With's design agency Pictogram — is, as they describe, a "monthly digest of two 5k wallpapers and other perks."

For $5/month or $50/year, you not only get two 5k wallpapers every month (perfect for the Retina iMac), you gain access to the existing library of images, of which there are currently 12. You'll also get early access to sweet icon packs such as Muir, as well as prioritized icon and wallpaper requests.

Check it out.