Mastercrafting with a little flair...

[aglondier]

I have the article from Dragon magazine #358, Masters Forge, and that's a great start...but I was wondering if anyone had more weapon/armour smithing options to make mastercrafted gear actually worthy of the name? Links or even just search keywords would be greatly appreciated ☺

[Psyren]

Do you mean putting cosmetic flairs in your work, or maybe a signature look of some kind unique to a particular creator or even typical of an entire race? Either way, Pathfinder Unchained has expanded Craft DCs (https://aonprd.com/Rules.aspx?Name=Expanded%20Craft&Category=Expanded%20Skill%20Uses) to let you identify things like that, so it seems you can just add that stuff to the things you craft for free if you're using those.

[ShurikVch]

Master Craftsman base class (Dragonlance, War of the Lance) can take - at 1st level and every 3 levels later - such Knacks as:
Item of Distinction (required 3 ranks in suitable Craft skill) - works like a common masterwork item, but costs only 50% to create, and can be recognized with DC 15 Appraise check
Item of Renown (required 6 ranks in suitable Craft skill) - weapon gets +2 to attack rolls, armor -2 ACP, and tools confer +4 bonus on skill checks; cost the same as a common masterwork item, but take twice as long to create
Item of Fame (required 9 ranks in suitable Craft skill) - weapon gets +3 to attack rolls, armor -3 ACP, and tools confer +6 bonus on skill checks; take trice as long to create, and "masterwork cost" is tripled (+900 for weapons of fame, +450 for armor of fame, etc)
Item of Glory (required 12 ranks in suitable Craft skill) - weapon gets +4 to attack rolls, armor -4 ACP, and tools confer +8 bonus on skill checks; take four times as long to create, and "masterwork cost" is quadrupled (+1200 for weapons of glory, +600 for armor of glory, etc)
Item of Legend (required 15 ranks in suitable Craft skill) - weapon gets +5 to attack rolls, armor -5 ACP, and tools confer +810 bonus on skill checks; take five times as long to create, and "masterwork cost" is quintupled (+1500 for weapons of legend, +750 for armor of legend, etc).

[Dr_Dinosaur]

If you're looking for alternate mechanical effects, swapping the standard +1 to attack rolls for an equivalent bonus or trait seems simple enough. A smith who favors hefty, reinforced blades that seldom break might offer a masterwork longsword with a bit of bonus HP/hardness/sunder DC (depending), while the cruel masterwork dagger looted from a demonic assassin could have tiny barbs just past the edge that increase any bleed damage you inflict with it by 1. A masterwork silver blade could just lack the penalty to damage, though I would hesitate to swap the attack bonus for bonus damage on any weapon that doesn't come with such a penalty normally