NAHDS Project (Not Another HD Sprites Project) is a set of HD (around x4) sprites for ZDoom that works with any wad and uses standard sprite names.

HD PICKUP SPRITES DOWNLOAD
In this folder you'll be able to find the latest version of the mod as well as some other sprites which might have not been included in the mod per se, but are still good enough to be put next to it.
Originally this project was a part of HD pickup items created for my Beautiful Doom mod. But recently it has become a rather independent endeavor and thus it has its own name.
The sprites are mostly created by Death Egg. Some of them were partly made by me. The weapon sprites are based on drawings by Franco Tieppo (with the author's permission).
Death Egg is now the mod's manager. It's only logical since he made most of the sprites and has a pretty good idea of how it works.
Note that these are actually HD, not just hi-res. I.e. they have higher level of detail compared to original sprites.
Also note that sprites are PNG using only Doom palette colors (weapon sprites aren't technically paletted because something weird kept happening to them unles I imported them as RGB; but they still only use colors from Doom palette). Hard edges and Doom coloring helps them not stand our much if used in the game. They also try to stay as close to originals as possible. Examples of small deviations are: Rocket, Clip, Skull Keys, Armor Bonus.