Pillow cases take almost a yard of fabric. yes quick to make, but fabric averages $10.00/ yd.
Table runners, even the 10 minute one take 2 fabrics, almost a yd total. Again fast project.
Rag rugs are beautiful. Unless everyone is making them price higher, lots of labor in them.
Good luck.
I do a lot of craft shows. It is always hasrd to know what will sell. If you price higher, you can always offer a 20% OFF THE LAST 2 HOURS OF SHOW.