Pictured below are just three types of Dorset buttons:
Blanford Cartwheel
Crosswheel
Knob Dorset
(Above pics courtesy of the British Button Society)
They are considered to be the very first thread buttons and were often made by lacemakers. Thread is wrapped around a flat washer or ring and then filled in with stitches.
Modern day Dorset buttons have exploded into a infinite number of designs and colors:
is a fabulous site that gives lots of background and historical information on dorset buttons, not to mention other sorts of
needlework, ribbons, tassels, laces and more
it's one of my favorites!
I've never tried to make Dorset buttons but there are a huge number of sites out there with instructions so I think i'll have to give it a try.