This pattern is available free on my blog with a detailed picture tutorial as it seems rather strange the first time through.  After the first few rows this becomes a quick and easy pattern to complete.

I used a cotton made in Holland, and I estimate that it is about a size 3 cotton.  It is smaller than Sugar N'Cream or Peaches N'Cream, but any size cotton can be used with the correct size hook!

I tried my hand with the larger cotton (Anchor Magicline) and used a F hook (3.75mm) which turned out nicely. Please note that the larger yarns will need a smaller hook than requested for that yarn or a tighter gauge as having a loose gauge will result in larger holes between the clusters!