What kind of pictures do you post?

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Are we allowed to post anything we want? i mean as long as it's not stolen from anybody or if we didn't take it from a site that has reserved its rights on it.. are google images allowed here? because i think that as long as you can take them for free from google you should also be allowed to use them.. As for example,if i post a discussion about fire, and i take a google picture with some flames,i have the right to do that? Or do they all have to be mine? taken with the phone or my digital camera? how do you do it? Did it help you earn more?