Many Open Access resources explicitly encourage reuse of their materials. Until these will be laid out here in more detail, you can start browsing from commons:Commons:Open Access File of the Day, Wikipedia:Category:Open access journals or http://www.doaj.org/.
If you happen to reuse some materials from OA sources, it would be good to let them know. Many journals now allow to comment on the articles they publish.
Another issue pertaining to the reuse of OA materials is that of finding wiki pages that would benefit from the addition of available images or multimedia files. For example, do you have suggestions where the following images might go?
http://www.hindawi.com/journals/psi/2011/473481/
http://www.hindawi.com/journals/psi/2011/473481/fig2/
http://www.hindawi.com/journals/psi/2011/473481/fig3/
http://www.hindawi.com/journals/josteo/2011/810697/
http://www.hindawi.com/journals/josteo/2011/810697/fig1/
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http://www.hindawi.com/journals/josteo/2011/810697/fig3/
http://www.hindawi.com/journals/ijol/2011/890380/
http://www.hindawi.com/journals/ijol/2011/890380/fig1/
http://www.hindawi.com/journals/ijol/2011/890380/fig2/
http://www.hindawi.com/journals/psyche/2012/183284/
http://www.hindawi.com/journals/psyche/2012/183284/fig1/
http://www.hindawi.com/journals/psyche/2012/183284/fig2/
http://www.hindawi.com/journals/psyche/2012/183284/fig3/
http://www.hindawi.com/journals/psyche/2012/183284/fig4/
http://www.hindawi.com/journals/psyche/2012/183284/fig5/
http://www.hindawi.com/journals/psyche/2012/183284/fig6/
http://www.hindawi.com/journals/psyche/2012/183284/fig7/
http://www.hindawi.com/journals/psyche/2012/183284/fig8/
http://www.hindawi.com/crim/cardiology/2011/505216/
http://www.hindawi.com/crim/cardiology/2011/505216/fig1/
http://www.hindawi.com/journals/jmb/2011/460173/
http://www.hindawi.com/journals/jmb/2011/460173/fig2/
http://www.hindawi.com/journals/jmb/2011/969173/
http://www.hindawi.com/journals/jmb/2011/969173/fig1/
http://www.hindawi.com/journals/bmr/2011/583439/
http://www.hindawi.com/journals/bmr/2011/583439/fig1/
http://www.hindawi.com/journals/bmr/2011/583439/fig2/
http://www.hindawi.com/journals/bmr/2011/583439/fig3/
http://www.hindawi.com/journals/bmr/2011/583439/fig4/
http://www.hindawi.com/journals/bmr/2011/583439/fig5/
http://www.hindawi.com/journals/bmr/2011/583439/fig6/
http://www.hindawi.com/journals/bmr/2011/583439/fig7/
http://www.hindawi.com/journals/bmr/2011/583439/fig8/
http://www.hindawi.com/journals/bmr/2011/583439/fig9/
http://www.hindawi.com/journals/av/2012/586389/
http://www.hindawi.com/journals/av/2012/586389/fig1/
http://www.hindawi.com/journals/stni/2012/282987/
http://www.hindawi.com/journals/stni/2012/282987/fig1/
http://www.hindawi.com/journals/stni/2012/282987/fig2/
http://www.hindawi.com/journals/xroi/2010/412323/
http://www.hindawi.com/journals/xroi/2010/412323/fig1/
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http://www.hindawi.com/journals/xroi/2010/412323/fig3/
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http://www.hindawi.com/journals/xroi/2010/412323/fig8/
http://www.hindawi.com/journals/xroi/2010/412323/fig9/
http://www.hindawi.com/journals/ace/2011/478475/
http://www.hindawi.com/journals/ace/2011/478475/fig2/
http://www.hindawi.com/journals/ace/2011/478475/fig8/
http://www.hindawi.com/journals/ace/2011/870383/
http://www.hindawi.com/journals/ace/2011/870383/fig1/
http://www.hindawi.com/journals/ace/2011/870383/fig2/
http://www.hindawi.com/journals/ace/2011/870383/fig9/
http://www.hindawi.com/journals/ijcgt/2009/726496/
http://www.hindawi.com/journals/ijcgt/2009/726496/fig11/
http://www.hindawi.com/journals/ijcgt/2009/726496/fig15/
http://www.hindawi.com/journals/ijcgt/2009/726496/fig16/
http://www.hindawi.com/journals/vmi/2011/974785/
http://www.hindawi.com/journals/vmi/2011/974785/fig1/
http://www.hindawi.com/journals/vmi/2011/974785/fig2/
http://www.hindawi.com/journals/vmi/2011/974785/fig8/
http://www.plosone.org/article/slideshow.action?uri=info:doi/10.1371/journal.pone.0024959&imageURI=info:doi/10.1371/journal.pone.0024959.g001
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