Sorry I've been away so long. Long, shitty graveyard shift at work.
Well, I had the progressive Goblins make a startling and important discovery that cemented their architectural prowess: Asbestos. They used captured elven slaves to mine it.
Despite being a low-ish magic setting, the HobGoblins had discovered their own version of Mithril. Painiron. Mechanically identical to Mithril in the regular DnD books, but any weapon made of it counts as a Bane weapon against all types of humanoids, wielder included. Commonly used as an arrowhead to avoid the nasty side effects. The hobgoblins had united under one religious leader, tired of centuries of oppression, and slash-and-burned the Elven homelands, conquering three of their four major cities and imprisoning them in their last sea-side bastion while the captured elves slave away in mines across the continent.
Lizardfolk actually lived like the cliff-dwelling native americans of the American SouthWest. They built their homes to maximize sunlight exposure and defensibility. Instead of swamp-dwelling, they had a rudimentary climb speed like desert lizards, making it easy to get around their elevated villages. Their eyes had limited color sensitivity, but were keep at picking out patterns, textures, and movement. That led them to very advanced woven artwork, blankets and rugs of vibrant colors (incidental, the dyes are used to alter textures on the threads) hung on poles and bannisters to ripple in the cliff-side winds. Their weaving is second to none and one of their main luxury trade items.
Bugbears took the place of semi-civilized ogres in my setting (orcs=humans, goblins=halflings, hobgoblins=elves, Bugbears=ogres.) Often living in simple tribes, both traditionalists and progressives try to recruit them for their brawn, and to lessen the threat of them raiding unchecked.