Pottery

Apudark's guide
Unfired Small Bowl to 102
 * No farming required.

Unfired Medium Bowl to 122
 * No farming required.

Unfired Large Bowl to 148
 * No farming required.

Unfired Sealed Poison Vial to 188
 * No farming required. Crows Special Brew can be purchased in Plane of Knowledge.

Unfired Casserole Dish to 199
 * No farming required.

Unfired Planar Stein to 216
 * Tainted Planar Essence drops frequently in several Planes of Power zones. Get it in Plane of Water while farming for other tradeskill materials.

'''The simplest combines from this point will be Unfired _____ Hilt Casting Molds. However, these do require silks. I personally did:'''

Unfired Stalwart Hilt Casting Mold to 268

Unfired Extravagant Hilt Casting Mold to 282

I understand that silk supplies are limited, especially when Immaculate and Fantastic can be used for other, better recipes, but other pottery alternatives are tedious and this guide's focus is simplicity and speed. The good news being you can hit 300 and max your trophy without farming anything.

Unfired Star Ruby Encrusted Stein to 335
 * No farming required. This combine may seem pricey, but when compared to alternatives like Power Sources, it's actually pretty cheap.

Stillwaters' guide (may be outdated)
A slight preface to Pottery: It would be a good idea to make real good friends with an enchanter, or just be antisocial and make an enchanter of your own. Or, if you are an enchanter ignore this preface, as it doesn't apply to you.

Unfired Small Bowl to 102
 * Unfired Small Bowl:
 * Bowl Sketch
 * Small Block of Clay
 * Water Flask

Notes: Look to Gligo Muddypants for the Bowl Sketches. Northern trade building, Pok. Elisha Dirtyshoes also of the northern trade building sells Small Blocks of Clay. Nearby, in the northern trade building complex is Yeril Imsin, who conveniently sells Water Flasks.

Unfired Murky Energeian Ice Orb to 250
 * Unfired Murky Energeian Ice Orb:
 * Copper Infused Energeiac Clay
 * Pure Copper Ingot
 * Small Block of Magic Clay
 * Block of Magic Clay
 * Large Block of Magic Clay
 * Large Block of Clay x5
 * Spell: Mass Enchant Clay
 * Water Flask x3
 * Sunshard Pebble
 * Distilled Essence of Ice
 * Murky Energeian Sketch
 * Vial of Cloudy Mana
 * Peridot x5
 * Poison Vial x5
 * Spell: Mass Cryastallize Mana

Notes: Oh boy, big list here. Pure Copper Ingots, Distilled Essence of Ice, Murky Energeian Sketches are all sold by Merchant Woad, an npc who irritatingly wanders between the Toxxulia zone line and the merc camp in Barren Coast.

Large Block of Clay are sold by Elisha Dirtyshoes in the northern trade building complex. Peridot can be bought from Kirem Deepfacet in the northern trade building complex. Poison Vials come from Loran Thu'Leth in the western trade building.

The Mass Crystallize Mana spell is bought from Palik Agrolm, in the Commonlands tunnel (Level 20 required enchanter to cast). Spell: Mass Enchant Clay has a level 8 requirement to cast, and is also sold by Palik Agrolm.

Please tell me you can find a Water Flask vendor by now?

Unfired Ceramic Fist Ornament to 302
 * Unfired Ceramic Fist Ornament:
 * Ceramic Fist Ornament Mold Sketch
 * Cosgrove Infused Clay
 * Cosgrove Powder
 * Water Flask
 * Large Block of Magic Clay
 * Large Block of Clay x5
 * Spell: Mass Enchant Clay

Notes: Ceramic Fist Ornament Mold Sketch is sold by Useful Automated Vendor in Brell's Rest. Cosgrove Powder can be found HERE. The clay info has already been covered /shrug.

Thanks to Stillwaters, a/k/a arkadykappa, for this guide.