An Open Source of Cliparts- FREE Cliparts

I suppose Open Clipart Library provides an open source of cliparts, which are free for using on both personal and commercial projects. http://openclipart.org/about

An example of clipart from above website,
http://openclipart.org/detail/170483/peace-by-ilnanny-170483
http://openclipart.org/byhits-last-month

To download images from the open clipart library, click interested images--> click PNG (you can choose to type resolution you desire or not) --> right click optical mouse --> choose "save image" as PNG format.

P.S.
If you like it, you may donate to this open source at the bottom of the website, or just enjoy free cliparts.

If softwares, images or anything are provided as an open source online, I guess they do not need money, but you can always donate any amount of money anytime only when you feel like to. No stress! No worries!!!