I just converted my gas fireplace to have fire glass, but the unsightly gas line is showing!

I tried covering it with lava rocks...but it ended up looking like a random pile of poo :(

I do not think I can pile the fire glass up high enough to cover it without it overflowing from the fireplace.

Whatever I use to cover it needs to be able to be in the fire. Future plans to re-do the mantle and replace existing tile with black, white, or marbled tile.

Thank you so much for any ideas or suggestions!!!