Here is a selection of my own creations.
Thanks to Tellus and Xavi for fixes and feedback.
This post has been edited to keep this tread tidy.
End of the Ride
ReAn: 10 (2 [ReCo], Sight +3, Mom, Ind, Size +1)
You make a horse lose control of one of its legs. The horse must roll Quik+Athletics to keep on its feet. For a standing horse the required roll is 6+, for slow walk 9+, regular ride 12+, and fast ride 15+. If the horse falls the rider should take a ride check of the same difficulty to avoid damage. On a failed roll both the horse and rider suffers a hit of +Dam equal to the amount the difficulty exceeded the roll.
One of the Flock
MuCo(An) 15 (10, Per, Conc +1, Ind, no extra for changing effect due the requirement)
You transform into any land animal no more than two steps from your original size. To use this spell you must be surrounded by at least [3-size] animals of the same type. The spell ends if you leave the flock.
Heartbeast’s Voice
MuAn 10 (5, Per, Diam +1, Ind)
Gives a magus in animal form the ability to speak as a human. The voice will have the beast’s tone and sound, but the mage can speak as clear as he can as a human. This will only work if the animal form already has useful hearing and at least minor vocal skills (like a cat or a bird).
Heartbeast’s Hands
MuAn 5 (3, Per, Diam +1, Ind, +1 two limbs)
Gives the magus in animal form the ability to use two of his limbs agile enough to operate most human objects and even do spell gestures with a -1 penalty. This will only work if the animal form already have paws, toes or similar (like a cat or a bird).
Whispers of the Wizard
CrIm 5 (1, Sight +3, Mom, Ind, +1 eligible speech)
You make an illusion of a few words spoken by you appearing at any point inside the range.
Cool Death
CrAq 25 (4, Voice +2, Con +1, Ini, Re +1, water fit around any object in the area +1)
Fills an area of about 3 times 3 paces, 2 paces high with water, there is no need for confinements. The water will immediately freeze to solid ice.
Mirror Mage
ReIg 5 (4, Per, Con +1, Ind)
This spell makes the mage completely reflective like a mirror. Add requirements for clothing. A similar spell could make the mage appear black as the darkest night.
Note: The effects "stop all light" and "reflect all light" is considered to be unnatural, but doable. You could not change color with an Ignem spell, this is spell logics, not modern physics.
Sticky Shower
CrHe 10 (2, Voice +2, Sun +2, Ind)
You shower a target with a mashed plant material (e.g. crushed poor quality melon). If the target is moving a 6+ Per+Finesse is required to score a decent hit. This will leave a mess and should make the target easy to track.
The Wizard Who Wasn’t There
PeIm(ReIg) 25 (4, Per, Sun +2, Ind, smell, hearing, touch +1, moving image +1, no shadow +1)
The wizard is invisible, leave no shadow, doesn't smell and make no sound. He cannot be touched and leave no mark or sound on ground that can support him. If hit, he still takes damage.
Argumented Armor of the Battle Wizard
ReTe(Co) 20 (3, T +1, Sun +2, Ind, metal +2)
Worn metal armor apply no load and are of no hindrance inside its maximum flexibility. This spell will only work as intended for armor worn by the actual wizard.