Link to snowcatcher.net, for the pattern Mount Eolus Snowflake by Deborah Atkinson. Free pattern.
Link to section G of antiquepatternlibrary.org. The patterns I mentioned are in Priscilla Bedspread Book, edited by Helen Garbutt.
For the hexagon called elsewhere as "Marguerite":
Pictures are Figures 39, 40 and 41
Pictures are on pages 32 and 33 of the pdf (pages 29, 30 of the book)
The pattern is on page 38 of the pdf (page 35 of the book)
For the hexagon I am working on:
Pictures are Figures 48 and 49
Pictures are on pages 38 and 39 of the pdf (pages 35, 36 of the book)
The pattern is pages 41 and 42 of the pdf (pages 38, 39 of the book)
Link to tessellations.org .
Link to the book Designing Tessellations, by Jinny Beyer on amazon.com .
Yikes! I forgot to add the tessellation patterns! Here they are:
Link to MC Escher Birds Tessellation Messenger Bag by Katy Breithaupt on etsy.com. $ pattern.
Oh no! Escher' Horses Tote by Jessica Sant is no longer available on her blog. However, a someone on Ravelry has the pdf.
Link to More Tapestry Croceht by Carol Ventura on amazon.com. The Oval Purse That's "For the Birds" is in it.
Link to the blog Hyperbole And An Half by Allie Brosh. Direct link to the post "Depression Part Two".