I did a search for 'turquoise yellow grey' on quiltshops.com and 24 items came up. Might need to try again with "gray". Here's a link to a couple.....
http://www.desperatequilters.com/cgi...#M5873_1540_15
http://www.desperatequilters.com/cgi...#M5873_1540_15 (a flannel)
Hope that gives you some hope...... it is out there!