If you want a lot of great projects to carve, go to http://scrollsawworkshop.blogspot.com/2010/01/online-free-pattern-catalog-updated.html and you will find plenty. I have downloaded 100's of these patterns. This is a scroll saw pattern site, but all of them are adaptable for CNC work.
All of the patterns are PDF's and can be opened in most graphic programs. I download the pattern, open it in a graphic program,( I use PhotoShop), get rid of the gray overlay and then save the work as a SVG. Many of these projects I wanted to fill in areas as black, so I export them to Photoshop, then fill in the black areas, save it and open back in Illustrator (or Inkscape) and save it as a SVG file. Steve Good, the site owner, is aware of these patterns being used by us CNC guys.