It appears that gray is the new black .... or something like that! Seems like everything I see now is or has gray in it. Some I like, some I don't. I would think you might be able to find a gray and yellow in any fabric store now .... unless gray is already on the "outs" and a new color has taken over. You know, I just cannot keep up with all the new trends. Yep, I am not very trendy for sure.
PS: I just typed "yellow gray fabric" into ebay and you wouldn't believe the number of hits I got. I may have to rethink using those colors ..... or not!