Any tips for billboards

[Shev]

I'm trying to use billboards to make light beams you see coming out of windows, and I can't do it for the life of me. They always look paper thin and just bad.

Edit:
So far I've found fixed axis at various sizes and angles with a extremely dim color, and spam them all over the window works well, although it doesn't look amazingly good (some randomly bright lines that don't flow nearly as smoothly as the ones in game)