Courtesy of Bingo B. Boise, ID
Last year I planted "yellow" and "purple" onion bulb sets thick, and thinned them early in the season for "green onions" leaving space for the rest to grow into big onions in the fall. It worked great.
One thing that really got attention at my market was a bag with an onion, a couple peppers and a few tomatoes. I called it a salsa in a bag kit and they sold great. This year I'm growing a lot of cilantro to enhance the bag. These were a hit when everyone at the market had tons of tomatoes and you practically couldn't give them away.