I used the search option at the top of the board to search on celtic knot and came up with quite a long list of posts. Hopefully this click link will list the posts I came up with:
http://tinyurl.com/cwh
If not, try running your own search on celtic knot.
If an irish chain quilt was mentioned, you could also try searching on irish chain.
I don't remember the thread or stencil, but maybe you can find it this way.