Turn to orange because we've got to go on. Orange won't take you half so long. I'd want to have an orange juice break after that one. Maybe you can compare frozen, fresh and boxed orange juice and do a graph on qualities and preferences for each. Gather an assortment of oranges and compare them in the same ways.
Pumpkins are easier.
O'Neil brings up fire and sunset with orange as well as the feeling of saying goodbye. We've got to move on. Yellow is easy. There's the man with the yellow hat in the Curious George stories and another much more villainous one in Tuck Everlasting . Besides titles with yellow in them, bananas, lemons, canaries, daffodils and the sun, there's the feelings of yellow.