I have been scouring the internet for free tilesets that are open to you. I have found
http://lostgarden.com/ It does not seem very useful. There are a few things here and there, but overall not much to really make a game off of.
http://www.flyingyogi.com/fun/spritelib.html Spritelib is a little better it has some useful information, but is still the graphics are more in the 8bit variety.
http://reinerstileset.4players.de/ This is heavily stylized and its hard to have this match with any other free tile-sets available.
http://opengameart.org/ Check the licensing information before use, but it has things from all walks of life, including 3d.
All other sites I have found have just been rips from games and those are protected by a copyright and remain unusable. Right now I need simple objects to build the inside of buildings, but I have seem to have come up short in that area. I have plenty of things for outside of buildings, but nothing for in. I am hoping someone else has had this problem and has found a solution.
If not, I hope the information I have provided can help someone else in their conquest.