I'm pretty new to using perspective, so I'm going to try using this. Though I'm also probably going to try looking for different versions, since it seems to only work at 79% zoom on a 1000x1000 in. setup, which probably won't work so well for me for small stuff such as thumbnails. I'm guessing it is about 2500x2500 in. I'll also probably try dissecting/"reverse-engineering" it, I think I learn well by doing so.
Edit: I feel like a complete and total idiot! I can resize it according to my needs. I still want to analyze the distance from where the lines are placed, so I might get a better idea how it was made, and that will hopefully give me an idea of how to make my own perspective brush, in case I ever need/want to. No doubt I'm not going to be able to make a brush as good as this one however. Wish I had this while making my environmental design for my last class.