Large photo collection of birds, along with other nature related themes.
http://mydigitalmind.deviantart.com/gallery
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Interesting color related tool. One tool lets you choose up to 5 colors, and the collage wall on the left will auto select photos from Flikr that fit your color theme. Another tool lets you upload an image and it will pick out a selective palette for you based on that image.
http://labs.tineye.com
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Blueprtints of aircrafts for "anatomy" study of aircraft.
http://aviationshoppe.com
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Organized reference of military aircraft, small arms, etc.
http://www.militaryfactory.com
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Scroll down to see pictorial manuals for various martial art on whole body pose, arm position, lower body stance, and finger forms.
http://www.pinterest.com/peachymini/anatomy-and-character-poses
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Tumblr gallery of colorful or unique hair styles.
http://fuckyeah-hair.tumblr.com
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Photo collection of hairstyles, grouped by length, gender, and special occasion.
http://www.hairfinder.com/hairstyles_pictures.htm
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Historically accurate costumes.
http://historicalstock.deviantart.com/gallery
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Reference photo library of costumes without a human wearing them.
http://www.osfcostumerentals.org/stock/index.html
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A very large photo library of wild life in the UK, or by UK photographers. Most, if not all, of which are properly named in either common name or scientific name.
http://www.wildaboutbritain.co.uk/pictures
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