Cut the toasted nori into quarters. Place some sushi rice on the nori and roll it up using a sushi mat. Since the rice doesn't contain any other ingredients at this point, they should be a bit narrower than your usual sushi rolls.
After rolling, let it sit for about 10 minutes. Doing this will make them easier to cut.
Cut the sushi from Step 2 into bite-sized pieces. Have a tall glass of water on hand to dip the knife in while cutting. This will help them cut smoothly.
Next, put on your favorite toppings If you put 2 or 3 colorful toppings onto 1 piece, they will turn out colorful and cute.
Here are some ideas for toppings: natto & green onion; shredded omelet & natto; sweet shrimp & salmon roe; tuna brined in soy sauce & cucumber; scallops & shiso leaves.