Yellow Foods?

Do you mean yellow fruits & veggies mostly...like in "eating the rainbow" for health reasons? (they usually lump yellow & orange together)

www.ag.ndsu.edu/.../fn595w.htm#reasons

and:
Rainier cherries
yellow wax beans

If you are looking for yellow food of any kind for a theme type party...then:

banana (skin) or banana Popsicle
yellow popcorn (or buttered)
yellow lentils and some grains
various yellow candy (candy corn, lemon drops, yellow M&Ms...)
Mt. Dew soda, lemonade, eggnog
butter/margarine & some cheeses
mustard & some other condiments
some cakes & cookies & puddings
egg bread, egg noodles

egg yolks/scrambled egg dishes
polenta, grits, corn chips, tortilla chips
yellow rice or dishes with turmeric, etc.