I use clip art a lot for applique, find an image of what i'm looking for, enlarge it and print it out. When I did my son's wall hangings of the NHL hockey teams, I found pictures of the team emblems to use. Those I had to request permission to use them, what a rigamarole trying to make them understand what I was putting them on....guess they don't get many people using team emblems on a quilt! LOL
In the end they said as long as I was not selling the wallhangings, I could reproduce the emblems. :) His wall hanging of Michael Jordan's shoe, I got permission and they sent my son an autographed picture of Michael for him. :)