If you're a PC gamer, and your favourite titles are a few years old, they may be starting to show signs of ageing. What you need to spruce them up, then, is the ENB Series of mods by Boris Vorontsov.
Some of you may already be using them in games like Oblivion, Deus Ex and Vice City, but this clip posted yesterday on Reddit really shows that, if you've never heard of them before, you're really missing out.
By either adding new effects or messing with existing ones to improve things like lighting, Vorontsov is able to make an ancient game look, if not current, then at least a lot easier on the eyes.
If you've never used ENB before — or did a few years back when they were a little buggier — you can grab the necessary files and documentation for the mods off the ENB site.