Ahh thanks for the reply :) Yes my biggest concern is for the free stuff which isn't a major issue because most times I just make things for people's desktop backgrounds and whatnot and I can always make new stuff with each item I purchase which has become a small obsession for me now LOL

But I do know that most free stuff comes with a note saying if its allowed for commercial use, what I had thought I would do is contact the designer if I want to sell the artwork and get their permission specifically before selling it...