I rack 8-ball the same way everytime so when pot a ball I know where it came from and can develop a more consistent break. I left the pattern below, obviously it may not show up perfectly in here so the description is:
Start with the 1 on the foot-spot, skip a ball, 2, skip a ball, 3, skip a ball, 4, skip a ball, 5, skip a ball, 6. In the center is the 8, and below it the 7 & 15. Then I just match the stripes by color of the solids. In the bottom right you reverse the order of the 5 & 13 and the 6 & 14 so there is a stripe in the bottom right corner. It might be hard to visualize, so here is the pattern left to right:
----1
---9 6
--2 8 14
-10 7 15 5
3 11 4 12 13
Once you do it a few times it's second nature and in BCA it's a completely legal rack as the 8 is in the center, and there is a solid in the bottom left, and a stripe in the bottom right.