Think you are good at writing? Well, YOU ARE and maybe you could win a prize for it, too! Preview these lists of contests & choose one that gets you thinking. Then plan out your response, start writing, revise & edit your writing & finally ask someone else to look it over. You could be a lucky winner!!!
http://homeworkspot.com/elementary/contests/elementarycontest.html
Poetry Contest - http://www.youngvoicesfoundation.org/youngvoiceshome.html
A LARGE list of various competitions -http://www.hoagiesgifted.org/contests.htm