Links which may be useful in making buttons:

Dorset Buttons

http://www.britishbuttonsociety.org/20070401DorsetButtons.htm

http://www.craftstylish.com/item/42688/how-to-make-dorset-buttons

http://www.mandacrafts.co.uk/Links.html for Dorset and Yorkshire buttons

www.willofyre.com/buttons2.pdf forTurkish and Persian buttons

Polymer clay [Fimo]

http://www.craftstylish.com/item/42722/make-your-own-buttons-from-polymer-clay

http://www.beadsandbeading.com/blog/making-polymer-clay-buttons-for-sewing-knitting-scrapbooking/8336/

Chinese Knot

http://www.ehow.com/how_5025415_tie-chinese-knot-button.html

Wooden buttons

http://www.ehow.com/how_2294080_make-wood-buttons-from-tree.html

http://www.ehow.com/how_4524283_make-wooden-buttons.html

Leather Buttons

http://www.ehow.com/how_6747635_make-leather-buttons.html

Using templates

http://www.georgiaseitz.com/2007/brigittenbuttons.html creative buttons

http://www.disswoolandcrafts.com/acatalog/Shell_Buttons.html

Felted wool

http://www.ehow.co.uk/how_6969967_make-felted-wool-buttons.html

http://www.stickypawsfelting.co.uk/wordpress/?p=73 and other types of button

Button backs [for attaching to flat backed articles] available at

http://www.fredaldous.co.uk/

http://www.gregory-knopp.co.uk/

http://www.lightfindings.co.uk/index.php?cPath=5

Other types of buttons

http://www.eribe.co.uk/knitting/howtoknit includes a small entry on buttons

http://www.craftstylish.com/item/8202/how-to-make-a-custom-knitted-button-and-win-the-style-game

http://www.knittingdaily.com/blogs/daily/archive/2010/03/24/make-your-own-buttons.aspx covering a cardboard circle with yarn