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I'm preparing a kobold warren for 5e night this weekend.
** spoiler omitted **
and alignment shiftsare welcome!
Rube Goldberg-esque triggers that rattle stones through narrow channels in the walls. No real direct damage, but the constant noise and echoes created can give the impression of an incoming large trap, disguise the movement of kobold troops into positions, or muffle the source of murder-hole arrows or other trap effects. Or just make the PCs paranoid.
Rubble or trash chutes at regular locations, easily tripped by kobolds in the area pulling on strings or slapping pressure points on the walls. Dumps stones or debris or junk behind them, possibly striking a PC in the fall area and certainly blocking the way for pursuit and slowing PCs down.
Concealed floor vents/trapdoors containing captured creatures - tamed or summoned - openable from the other side of murder-holes or spy tunnels, allowing monsters to pop out from unexpected locations, possibly right into the middle of the PC party.
Soft floors that survive kobold passage, but anything heavier will collapse under the players' feet, dropping them into something nasty - bug hives (ant and spider swarms are good starts), filthy water, pointed rocks, rusty spikes, good old pit trap, some monster's den, some monster's mouth, etc. etc. etc.
Oozes. Put appropriate oozes concealed everywhere. Firey oozes in flammable liquids. Metallic oozes hidden in treasure. Dark oozes hidden in rocks and rubble. Have kobolds show up carrying bits of rock salt for seemingly no reason - it's how they keep the things manageably sized. And if the PCs can figure that out, it might give them a nice little bonus. But don't make it obvious. ;) Slimes and molds can work in this niche as well.
Kobold War Roomba. A tiny construct made of scrap metal, driftwood, twine, spiderweb, and sheer kobold tenacity. It rumbles along silently, poking anything it encounters with the bits of pointy, rusty metal sticking off every surface, and scoops up any pieces of debris, stone, trash, etc. it encounters and launches it at invading PCs with a miniature catapult (treat as a sling or crossbow?).
Skunk-in-a-trunk. I mean, need I say more?
Fool's Gold. Kobolds leave out a pile of junk disguised as precious gems, loose coin, bits of raw ore or precious metal, or other items. Heck, have a shaman cast Nystul's Magic Aura (I presume this still exists in 5e, I hope?) on some of it to make it detect as magical. Then either use the pile of "loot" as bait, or hide something nasty inside it.
False Dragon. Kobolds carve out a section of tunnel or stone to resemble a dragon. Blowing through a bullhorn to make it roar, using alchemist's fire or similar items/spells to produce its breath weapon, using long poles ending in rakes or barbs or bear traps to simulate claws and/or bites.
Lodestones embedded in walls. In close quarters, metal objects - weapons and armor especially - get pulled towards the walls by the magnetism, possibly imposing a penalty on attacks and/or AC.
I'm sure I'll think of more later. >:D