Wpclipart provides free images that are easy to download. Even your granny can use it and will be delighted by the browse feature.
You can search by theme or by keywords within a search box. It has turned to be a real educational source and parents you do not need to worry about how safe you children are since the collection itself is specially aimed for school projects. That is how it started actually but nowadays its targets include all kinds of creative people interested in browsing and downloading images that can be sent and used with several graphical editors and other software applications such as Word, OpenOffice. Most of the images were created by Paul Sherman, a photographer and programmer, the rest has been acquired from several online sources and is legally documented within the website. 
