Ptil Tekhelet Foundation
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Ptil Tekhelet is the Association for the Promotion and Distribution of Tekhelet. It is based in Jerusalem, Israel.
Based on the biblical commandment cited below from the book of Numbers, this group attempts to revive the mitzvah of wearing a blue (tekhelet) fringe on the tzitzit.
"Speak to the Children of Israel and bid them that they make fringes on the corners of their garments throughout their generations, and that they put upon the fringe of each corner a thread of blue (tekhelet). And it shall be for you as a fringe, that you may look upon it and remember all the commandments of G-d, and do them..." (Numbers 15:38-39)
[edit] Summary
Ptill Tekhelet Foundation supplies Jews with blue dye derived from sea snails to dye the fringes of their garments, or tzitzit.