LOL....I was not expecting you to suggest use BIGGER yarn!!! That's a good one!
Umm...I'm using the Red Heart Comfort Knitting Worsted type of yarn, I bought 6 balls (in different colors). They are 10 mm straight needles. And it doesn't matter which project it is, scarves and hats. I've never used any size larger than 5.5mm so, I really want to use them.