The pattern contains graphs and written instructions for Regular Overlay mosaic crochet, with an option to make it multi color like the picture. The Endless method is also included with the written instrutions.
For more information on the different methods and a sampler pattern to try, please see my Snowflake Block (free Ravelry download)

My alphabets can be found on my Ravelry page for free. Or be creative and use any font you like.
Join my facebook group (linked on last page of pattern PDF) and request the words in the pinned topic for Alphabets.

Yarn usage estimate
Based on crocheting with a 4 mm hook in Durable Cotton Fine (#3 DK) cotton/acrylic blend 105m/50g per ball.

Main Color 3140 yds/2850 m and Accent Color 2270 yds/2060 m.
For an envelope border of 3 rows with double crochet, an additional 830yrd / 760m is needed.
Size (Without border): 53x56in / 133x139cm (gauge: 16 stitches/rows per 4in/10cm).

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It is not allowed to share/sell the pattern in any format. It is allowed to sell the products made from this pattern.

Have fun with creating and please let me know if there is anything in the pattern you have questions about.