Can structural bricks be used as pavers for a patio?
For brick driveways the most important part is a solid compacted base--crushed quarry rock or shale, not crushed river rock. Sand is normally used, not mortar. 

For a “green” drive, place the holes vertical and fill with dirt and then grass seed. I have done this and if kept moist with drought resistant grass it works well (but I live in the grass dead capitol of the world). Keeping it trimmed is a chore as a lawn mower is too tall and a weed eater inconsistent. I purchased a Toro fly mow from a friend and that really works well (lawn mower with no wheels floats on a cushion of air). I think they are for golf greens but not sure. 

If you don’t want grass turn sideways and use poly sand to fill the cracks. Poly sand really helps prevent grass with pavers. As long as you have a solid base the bricks will hold up. If the base is not solid you will have ruts in short order.