Just as there's a yarn for every occasion, there's a KNOT for every occasion. The Fisherman's Knot is quite possibly the best one I know for keeping two ends of yarn together - and it does so without creating a huge, wonky protrusion in your fabric.
by Macrame Anna Cucè
by Nagu's Handwork
by PK C.I.T.I
by Poonam's Embroidery Studio
by crochet patternss
by Rebecca Diamond