I tried this wish spell, and it worked...
write your wish in a peace of paper, fold it and draw the godnesses mark (a full moon in middle and half-moons in both sides of it.) then fold it again, and draw a pentagram. turn it and write your full name and age in it. then place it in a safe place.
if the wish haven't happened yet and you want to cancel it, just burn the paper and bury the ashes in the ground or in a river.
when I tried it, it worked after 1-3 months (I don't remember it so well anymore...) but it happenet slowly, step by step.
and remember to write the wish to godness or god, and ask him/her to make it true to you. (NOT like: "I wish I'd have pony") be polite to godness/god.
[ [I found this spell from a wiccan site long time ago] ]
be careful what you wish for! and good luck ^_^