The feedsack prints all play nicely together, especially when paired with crisp white (white on white works nicely), you can also use period shades of pink, blue, green, yellow. Think any basic easy block that is roughly half background. Churn Dash, simple Stars, 9-patch, Broken Dishes... You can also go more all over color with something like Rail Fence. Because of the scale of the prints, I prefer to keep pieces around 2" or so.
For those that wish to showcase their quilting, you can do alternate plain squares, otherwise I typically do all over designs or at least sashing because my piecing is stronger than my quilting.
Edit: Here's a link to my album page. I need to add to it, but you might get some ideas in my "unfinished tops" section.
https://www.quiltingboard.com/member...56-albums.html