I love cobalt blue. When I put on the color I feel like it brightens my mood. I think cobalt blue is a perfect color for your work environment. You can pair blue with black or grey but keep color to your look. Here is another business casual look.
Cobalt Top - Banana Republic (no longer available) - Similar
Black Pencil Skirt - Loft (no longer available) - Similar
Black Pumps - Cole Haan (no longer available) - Similar
Silver Hoops - Gift