Yes, there is.
Here's an example using a light shade of blue:
.navbar-default {
background-color: #64B5F6;
border-color: #90CAF9;
}
/* you may need this part if the contrast of the icons / text isn't enough */
.navbar-default .navbar-nav>li>a, .navbar-default .btn-link {
color: #424242; /* darker grey than normal */
}
And here's an example using a dark shade of blue:
.navbar-default {
background-color: #0D47A1;
border-color: #1565C0;
}
/* you'll need this since the normal shade of grey isn't light enough */
.navbar-default .navbar-nav>li>a, .navbar-default .btn-link {
color: #E0E0E0;
}
.navbar-default .navbar-nav>li>a:hover, .navbar-default .btn-link:hover {
color: #FFFFFF;
}
