Additional information:
in my angels I filled the head with a bit of toy stuffing, but I think it may be small enough to maintain its shape even without that (depending on the yarn used).

ETA 28/12/2011: If you prefer to knit, you might want to take a look at Wullechneuel’s knitted version!

ETA 23/08/2014: German version added!

ETA 23/08/2014: There is now also a Dutch version - with many, many thanks to lilaloena, who provided the translation.