They are costly, but Japanese wovens are great for non-feminine quilts.
Another non-gender quilt is Postcards from Sweden. Really colourful!
Past that, quilts made with solids work well too...I like working with a simple design using just white, black and ONE colour, a technique I learned in a class called "Speed Date With Improv" by Krista Hennebury. The quilts with this palette look really striking and do not have a gendered feel:
https://www.instagram.com/explore/ta...atewithimprov/