Copying Noisms again--I did this and made some stuff.
Wall Link Zombie:
A regular zombie but the building's made of them. You see them, intertwined. They will remain inert until a trigger action is taken.
It's a small clamshell-shaped object--like a cigarettte-case--carved in some rich, deep red stone, set in colored bone or coral. In fact it is not a construct but a kind of highly evolved scarab beetle. It hibernates in its shell until it smells blood.
If placed in a pool of blood, its gold legs will extrude, and it will perform a sort of ritual mating dance in the blood, drawing patterns. Spells cast on the patterns will affect the target. Lasts until the blood is cleaned away.
Snow Wallow Nightmare:
A kind of 12' tall Asian snow mantis. Makes the snow viscous in a 20' radius--effectively slowing anyone trying to move or attack in melee (but not shoot or cast spells).
Royal Fist Monkey:
Small monkeys. Each wears one enormous Hellboy-like-but-jewelled glove with which they can smite with unseemly force. They are employed as personal bodyguards by southern drow dinosaur-princes.
Specter Master Lobster:
Ok, I have nothing genuinely good for this (or at least nothing I'd actually run), but I love saying it.
Ivy hair zombie:
Well, actually a Violet Leopard Orchid Zombie. But the queen of them. Her hair is a mass of creeping flowered tendrils.
Schultm's Skin Party
Wizard touches a target skin-to-skin. That target becomes glued to the wizard. Anyone touching the target with bare flesh becomes glued to the target and on and on.
A curse. Not obvious, but no-one will agree to buy anything from the target until it is lifted.
Like an alarm spell only the area warded must be a circle (size depending on caster's level), and the piercing sound of the alarm does d4-per-caster-level sonic damage to anyone not inside the circle.
Turns a vial of ordinary water into a magic liquid that can be thrown on the ground to make a 6-foot-wide magic puddle. The puddle is d4+1 feet per caster level deep and mutates anyone who touches it.
Wizard whispers a warning into a target's ear. Target then must whisper the same warning into the ear of everyone it meets for 2 hours. It may or may not believe the warning, but cannot tell anyone that until the spell ends.
Blood-alcohol levels of two targets switched.
Rodia's Complicated Siege
Cast on a foe's stronghold: transforms it into an Escheresque and non-euclidean maze--(roll on your favorite "weird dungeon effect" table for each room)--as difficult to exit as enter.
Nassim's Skull Ocean
A fucking ocean of fucking skulls fucking comes out of fucking nowhere and fills a 30-3000 square foot area. They fill the area 5 feet deep. Everybody caught in the ocean takes 2d6 damage and the skulls persist.
Caster becomes immune to attack from anything of a chosen color and anyone wearing that color. Only one Prismatic Law may be in effect on a given caster at any time.