In small saucepan, combine cherries, water, lavender and sugar. Heat mixture until it begins to boil. Remove from heat and allow mixture to cool completely. Strain and reserve liquid.
For each drink, combine 4 ounces cherry-lavender mixture and 4 ounces crushed ice in tall 12-ounce cocktail glass; top each with club soda. Garnish each drink with one cherry with stem and one sprig lavender blossoms.
Variation: To make an alcoholic version, shake or stir strained cherry-lavender mixture and ice with 9 ounces vodka. Strain into 8-ounce martini glasses, top each with club soda and garnish each with one cherry with stem and one sprig lavender blossoms.