I used a variety of double knitting yarns or a number of thinner yarns together that worked to a double knitting thickness on 4mm needles. Hence the poppies are not all the same texture or colour. The poppy centres were worked in a variety of green double knitting yarns with black embroidery.
There were ten ribbed poppies. Pattern here.
I have made a smaller version of the garter stitch poppy using 4ply yarn and 2mm needles. After making and adding a leaf or two it can be worn as a brooch. Picture to follow when completed.
Talking of poppies, on 14th June I found this self-seeded poppy in bloom against the public side of a neighbour's garden wall.
EDIT: 27th May 2017
The pattern for a leaf can be found here: https://paulineknit.blogspot.co.uk/2014/11/more-knitted-poppies.html
EDIT: 23rd June 2014
No more knitted or crocheted poppies are required by Huntingdon Library. Those already given to the Library will be used for future displays.
Knitted and crocheted poppies are required by St Hugh's Church, Buckden, c/o Buckden Towers.