Gauge swatch. If you're a tight knitter you might make gauge with the larger needles. It might not matter that much anyhow. Give it a go and see. Possible option: Use 2 colors held together for a unique, one-of-a-kind, never-to-be-duplicated, yours-and-yours-alone effect. Play with your yarn and needles and see what you get. You just might like the result of experimentation when you take your knitting fate into your own two hands! Your creativity is just waiting to be unleashed. Be brave, go where no one has gone before. You can do it!