My great nephew Drew turns three today! A friend, Colleen, told me about a page http://wandascrafts.blogspot.com:80/ that has some great free files on it. They are SVG which you can get a free download for Inkscape, save the file, open in Inkscape, save as an esp file, then import into KNK. Works like a charm. The card file is for the card and balloons. The 1,2,3 and the Happy Third Birthday Drew is just a font cut from vinyl.
Check out Wanda's site, she has some great free files. She also has a link to her store where she has files for sale reasonably priced.