IYIaster,
You can look for ideas and also research if a similar invention has been legalized (saving you time and legal litigation down the road) at this place:
http://www.freepatentsonline.com/
The fastest way is to look for "View Patent Images" in PDF format.
I have invented a couple of things myself (due to my job), without doing previous research; just to find out that a patent on identical inventions already existed.[
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Best luck with your project!