Well worth a look - Free Clip Art by Phillip Martin!.. Remember, it really is FREE art for your classroom, newsletters, or wherever you can find a non-profit use...  This is by far the best free clipart I have found, to brighten you worksheets and displays, really useful science, literature/grammer, ancient civilizations and religious characters to name but a few, all pictures are really good quality and are colourful and full of humour!

You must check out this free online image editing/drawing software, it's really brilliant!  All the tools of Photoshop but for free! 
Great if you want Year 5/6 to get a bit more creative or for your design needs.