here's a flock of birds in silhouette:
http://www.dkimages.com/discover/previews/827/35092292.JPG
red eyed tree frog:
http://upload.wikimedia.org/wikipedia/commons/e/ee/Red_eyed_tree_frog.jpg
poison dart frogs:
http://images.google.com/images?ndsp=18&um=1&hl=en&q=poison+dart+frog&revid=254819349&sa=X&oi=revisions_inline&resnum=0&ct=broad-revision&cd=3
praying mantis:
http://img2.timeinc.net/toh/i/g/1106_bugs/Praying-Mantis-01.jpg
leafy sea dragon:
http://www.plambeck.org/oldhtml/journal/seadragon.jpg
Picasso's drawing of a camel:
http://www.poster.net/picasso-pablo/picasso-pablo-the-camel-7900434.jpg
Rembrandt's signature:
http://sam.dev.uen.org/utahlink/tours/admin/tour/17720/17720LE285FRembrant.gif
'listening and speaking symbol':
http://www.eccv.org.au/images/InterpreterSymbol.jpg
'light bulb moment':
http://www.crystal-d.com/sites/crystal-d.com/files/images/Light-Bulb.jpg
vase/face:
http://farm2.static.flickr.com/1015/1058048330_70f784ebd3.jpg?v=0
That's all I've got for ya!
luck