I love all colors of fabric and I tend to lean toward earthy colors that I put in my shop. So, therefore i think earthy colors are so in style all the time. So when a new season comes around you don't really have to worry about introducing alot of new colors in your shop.
I make most of my stuff custom so my customer picks out the colors. I think though if I made in stock items, I would go with black of course, teal, pinks, blues things I like to be honest.
I think earthy tones will always sell though so fill up your shop :)
You are right Patti not everybody looks good in earth tones eapecially if you are dark complected. I love the jewel tones too. I order some bright pink and turquoise fabric today... Purple yes.....