Combine gelatins in a bowl and add boiling water; stir until gelatins completely dissolve. Chill until lukewarm, about 20 min.

Meanwhile, gently pull straws to extend to full length; place in tall container.

Blend cream and food coloring with the lukewarm gelatin mixture. Carefully pour into container, filling straws.

Chill until gelatin is firm, at least 8 hours, or cover and chill up to 2 days.

Pull straws from container or, if you're using a carton, simply tear the carton away from the filled straws. Pull straws apart. Run hot tap water for about 2 seconds over 3 to 4 straws at a time. Starting at the empty ends, push worms from straws with rolling pin, or use your fingers.