I have done this with elementary, middle, and high school students--and they all loved it. I've also given away dozens of this book--and it is available on Amazon.com for as little as one cent plus $3.99 s/h.
Note: there is NO answer key included in the book, but you can look it up online--or ask me for a copy of the file. And EVERYTHING on each page corresponds to the featured letter of the alphabet. (Plus, there's a secret image of the author himself as a little boy.)
Happy searching!! And here's the letter "C" for all you crafty cats!