I found this gray striped duvet at West Elm and I'll be watching for a sale.
I love it as a poor woman's version of this Serena and Lily duvet.
Yes, the West Elm stripe is missing the awesome green piping and is a totally different color - but I actually like it more. The gray will definitely read less nautical and I think the gray will look lovely with the orange bunkbeds (that currently live in my head since we are nowhere near ready to tackle that project).
Obviously the best part is that the West Elm duvet is only $59 - almost $100 less each than the Serena and Lily duvets.