Grand Theft Auto IV's iCEnhancer series of mods and tweaks takes a Rockstar PC game that looked pretty good already and turns it into - relative to the scale and size of GTAIV - the prettiest video game on the planet.
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At least, if realism is your thing.
And if your PC can handle it.
The mod's creator, Hayssam Keilany, writes "Reflections are bugged because of the ROCKSTAR VIDEO EDITOR. It doesn't look like that in-game, don't worry & sorry about that."
Version 2.0 of the mod is now out and free to download at the link below.
iCEnhancer 2.0 [icelaglace]