HI, Myles. You can simply press the + sign next to your dimensions and/or expressions to expand them. Then select Background Color and create whatever background color expression you like. For instance, you could say:
if(today()-[Project Created Date]>30 and not match(Status,'A','B','C','D'),lightred())
I have taken Vlad expression and created a sample app for you. In this sample you can see the highlight only for one row or the entire row. Hope this helps....