I have to say, I'm never a fan of seeing another artist's work posted under someone else's name, even if it's good work. I understand that you state they came from the Internet, but there are a few guidelines when doing so.
1.) You should check to make sure that their material is released under the public domain license.
2.) You should get permission from the original artist to redistribute the work.
3.) You should at least have a link back to the source of the original artist's work.
Original artist: http://customize.org/cursor/39759