Recipes. As for every food day, recipes are a great avenue. People enjoy trying new things out, and if you're in the food and restaurant industry, use this to your advantage!
Art. Hey, if you're all about art, fashion, & style, you can show off what you've got going on in your right brain. Make a dress out of noodles, post it. Make an art piece, a sculpture. Make appliances and things, perhaps hair ties, clips, bracelets, rings... the list goes on and on!
Hashtags to use: #NationalNoodleDay, #NoodleDay, #Noodles.