The key is to use background-image for image and background for gradient.
I have included redundancies for other browsers.
.Blue{
background:#47b; /* Old browsers */
background:-webkit-linear-gradient(top,#47b 0%,#249 100%); /* Chrome10+,Safari5.1+ */
background:-o-linear-gradient(top,#47b 0%,#249 100%); /* Opera 11.10+ */
background:-ms-linear-gradient(top,#47b 0%,#249 100%); /* IE10+ */
background:linear-gradient(to bottom,#47b 0%,#249 100%); /* W3C */
filter:progid:DXImageTransform.Microsoft.gradient(startColorstr='#4477bb',endColorstr='#224499',GradientType=0); /* IE6-9 */
background-image: url("/Style Library/Images/Recurr.png") center no-repeat;
}