There seem to be countless ways to knit sock heels. I find one of the most interesting the subsequently knitted heel, where you simply knit at the right place with a scrap thread which will be taken away later and then you can ‘fill’ the opening.
If you don’t even like this heel, simply knit a sock without heel ;-)
Links:
Sock Heel Knitting (how-to: afterthought heels)
via: simple yoga socks
Here at unikatissima:
Sock without Heel