Image design : different patterns and how to use them with GIMP ?

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http://ubuntuforums.org – I have created a well amount of different 8x8 pixel .png images, that i will use as a patterns when creating and designing different images, starting with photoes to my own small java games. I need to ask, as i am no way an pro with artistics designs, that, what about copyrights of different 8x8 pixel images, how freely i can use my own black & transparent images, as i surely know that someone else may or surely has drawn them somewhere earlier. Here is a link to some of my 8x8 pixel images i want to use - http://patterns.dy.fi I need to know how i can use, or can i at all use images li (Hardware)