These were made with a combination of patterns plus modifications:
Sushi rolls, soy sauce bottle, onigiri, ebi (shrimp) and tamago (egg) nigiri: Hooked on Amigurumi
Edamame, wasabi: Crochet Cafe
Tuna and hamachi nigiri: AmiAmour
Salmon, tako (octopus) and unagi (eel) nigiri: my own design