This guide will provide you with the fastest and least expensive way to level your Inscription skill up from 1 to 600. The guide is up to date for WoW patch 5.0.5
Inscription is the best combined with Herbalism. This way you can farm all the necessary herbs yourself and save yourself a lot of gold, otherwise you will need either a guild (or friends who are happy to help) or plenty of gold!
You can use Milling to mill 5 identical herbs for 2 - 4 pigments.
• Ivory Ink / Moonglow Ink - Alabaster Pigment - Peacebloom, Silverleaf, Earthroot
• Midnight Ink - Dusky Pigment / Verdant Pigment - Mageroyal, Briarthorn, Swiftthistle, Bruiseweed, Stranglekelp
• Lion's Ink - Golden Pigment / Burnt Pigment - Wild Steelbloom, Grave Moss, Kingsblood, Liferoot
• Jadefire Ink - Emerald Pigment / Indigo Pigment - Fadeleaf, Goldthorn, Khadgar's Whiskers, Dragon's Teeth
• Celestial Ink - Violet Pigment / Ruby Pigment - Firebloom, Purple Lotus, Arthas'Tears, Sungrass, Blindweed, Ghost Mushroom, Gromsblood
• Shimmering Ink - Silvery Pigment / Sapphire Pigment - Golden Sansam, Dreamfoil, Mountain Silversage, Sorrowmoss, Icecap
• Ethereal Ink - Nether Pigment / Ebon Pigment - Felweed, Ragveil,Terocone, Ancient Lichen, Nightmare Vine, Netherbloom, Mana Thistle, Dreaming Glory
• Ink of Sea - Azure Pigment / Icy Pigment - Icethorn, Lichbloom, Fire Leaf, Fire Seed, Tiger Lily, Adder's Tongue, Deadnettle, Goldclover, Talandra's Rose
• Blackfallow Ink - Ashen Pigment / Burning Embers - Azshara's Veil, Cinderbloom, Deathspore Pod, Heartblossom, Stormvine, Twilight Jasmine, Whiptail
• Ink of Dreams - Shadow Pigment / Misty Pigment - Green Tea Leaf, Rain Poppy, Silkweed, Snow Lily, Fool's Cap
• 110 Alabaster Pigment
• 70 Dusky Pigment
• 170 Golden Pigment
• 170 Emerald Pigment
• 160 Violet Pigment
• 80 Silvery Pigment
• 160 Nether Pigment
• 400 Azure Pigment
• 140 Ashen Pigment
• 320 Shadow Pigment