gradients.styl

gradient-with-fallback(fallback=none, gradient-args...) {
    args = unquote(join(", ", gradient-args))
    fallback = typeof(fallback) == "string" ? unquote(fallback) : fallback
    background: fallback
    background-image: -vendor-linear-gradient(args)
    background-image: linear-gradient(args)
}

.test {
    gradient-with-fallback(#FFF 150px, #CCC 100%, fallback: top left repeat-y url("some/image.jpg"))
}
.another {
    gradient-with-fallback(1, 2, 3, fallback: url("some/image.jpg"))
}