Place silicone ice cube tray with round cubes (1 1/4-inch diameter) on cookie sheet. Squeeze about 1 tablespoon yogurt in each cube depression. Place 1 candy eyeball in center of each yogurt cube; cover tray with plastic wrap. Carefully transfer cookie sheet with tray to freezer.
Freeze 1 hour or until completely frozen. Immediately before serving, pour 1/2 cup chilled sports beverage into short, clear drinking glass. Place 2 yogurt cubes into each glass. Serve with straws.