I saw a 'gray rain' sort of fabric somewhere. Maybe on Fabrics.com or ThousandsOfBolts.com and search by color. Here's one: Sku #: 2045, Color: Grey, Fabric: Cotton,
Price: $8.25/yd at www.manhattanfabrics.com/search.cgi.
There's a Michael Miller fabric called 'Fairy Frost Silver' at fabrics.com, or 'Graceful Geisha Bamboo Stripes,' or 'Stonehenge Light Grey,' or 'Rainy Days & Mondays Cloudy Day'... all sort of rainy looking. Wouldn't you just know it - I found a couple I'd like to get myself. But until fabric.com learns to fold fabric and pack boxes neatly, as it used to do before just recently, I won't order there. You should see the mess I got from them the other day!