I have been looking around on various dungeon map making tools and I have not yet found one I am comfortable with. So I am thinking of creating my own online HTML5 dungeon map tool and share it with others.
My question is; where could I find tiles (and other images) I could use as assets for the online tool? Most tile-sets I have found are "for personal use", but publishing these online for "anyone" to use would probably break the license.
Where can I find tiles I could use? For free or commercial, as long as it can be part of the online tool so both myself and any visitor could use them.
Update 11 aug 2013: Looking for fantasy / D&D dungeon themed assets. Both cave, dungeon and perhaps inside a house. Any common format (PNG, JPEG, GIF, PDG) as I can convert them into what I need.
The biggest challenge, I think, is finding a library of different tiles that I can use online (for others). I don't mind "buying" commercial tiles, as long as I can share them online for others to use together with the tool. So any advice would be much appreciated :-)
Update 12 aug 2013: To give a move narrow description. I am looking for basic core tiles of different environments such as a cave, dungeon, inside buildings, etc. Rectangular tiles, minimum 100x100px large. Doesn't have to be 3d rendered, basic low-level works.
To give an example, tiles such as Heroic Maps would be awesome (but the license on them are "for personal use").