More ideas from Jitka
Celtic Heart Knot - The interlaced patterns in Celtic art are prominent on monuments and in illuminated manuscripts, such as the Book of Kells  - pattern by Maddy Cranley -

Ravelry: Celtic Heart Knot pattern by Maddy Cranley (free pdf) (although this is a knit I-cord, it can also be crocheted) excellent instructions (pics) by Sirkka