How I make mine is this, but not a vibrant green color, it's just more of a hue of green. Does that make sense?
About 2 cups of plain yogurt
1/2-1 whole cucumber (grated with skin on)
minced or prssed garlic to taste (About 1-3 cloves)
Salt to taste
Mint to taste (About 2-3 teaspoons dried)
Mix well, chill and serve.