01 -  Rinse sushi rice thoroughly in cold water until the rinse water runs clear. Combine rice with water in a small saucepan, bring to a boil over medium heat, then reduce heat to low, cover, and simmer for 10 minutes. Remove from heat and let stand, covered, for an additional 10 minutes. 
 02 -  Mix rice vinegar, sugar, and salt in a small bowl. Gently fold the mixture into the warm cooked rice using a rice paddle or spatula. Allow the rice to cool to room temperature before assembling. 
 03 -  Place one nori sheet, shiny side down, onto a bamboo sushi rolling mat. With moistened hands, spread a thin, even layer of prepared rice over the nori, leaving a 1-inch border along the top edge. 
 04 -  Sprinkle an even mixture of black and white sesame seeds over the rice layer. 
 05 -  Neatly position the julienned red bell pepper, yellow bell pepper, cucumber, carrot, sliced avocado, chopped pickled ginger, and cream cheese (if using) in a colorful row across the bottom third of the rice. 
 06 -  Using the bamboo mat, roll the nori and fillings tightly from the bottom edge towards the top, applying gentle pressure. Moisten the exposed edge of the nori with water to seal the roll. 
 07 -  With a sharp, damp knife, trim the ends and cut each roll into 4 uniform pieces for clean presentation. 
 08 -  Arrange the sushi rolls on a festive platter. Present with small bowls of soy sauce or tamari, wasabi, and additional pickled ginger.