This book, which teaches one to knit the forthcoming Royal Wedding, is definitely worth a look.
Since my mittens were not successful (although I have knit sweaters, hats, and scarves!), I doubt I will be taking on this task.
But if I were, I'd be tempted to knit a Princess Diana who could float above her son and his bride, sending them good wishes.
**As discovered via the lovely Needleprint blog.