A lot of people have, at some point or other, attempted to write using their other hand. Myself, being left handed, have found that whilst I can write decent non-cursive with my right hand, my cursive is shakey.
Put a series of writing exercises similar to that of the brainbuilder DS game, and presto!
As
an afterthought, this would be good for those with bad handwriting or for years 1-4.