BlueFlame

By default, fires burn blue like the Standing Blue-burning Iron Torch, and their light turns the same blue. Flames that use the game's colour-graded fire take the blue torch's own colours; other flames, sparks and glows are tinted blue. Only your game changes; other players see their fires as usual.

Settings are in com.parallel53.blueflame.cfg, all on by default: Fires (campfires, hearths, bonfires, standing and wall torches, braziers and other fires you refuel), HeldTorch, Portals, TeleportScreen (the swirl you see while teleporting) and CraftingStations (forges, smelters, kilns, blast furnaces, ovens, cauldrons and other crafting and cooking stations). The flashes and bursts of fire when you add fuel, craft or smelt turn blue as well; fireworks keep their colours. Restart the game after changing a setting. Fire arrows, burning, enemy fire and lava are left alone.