Just for future reference it is possible to add textures to a fontstring.
http://www.wowpedia.org/UI_escape_sequences#Textures
For example:
"|TInterface/Icons/Ability_Rogue_SliceDice:20:20:0:0:64:64:5:59:5:59|tMyText"
That's a 20x20 S&D icon (cropped by 5 pixels on each size to remove border) followed by MyText.