I've received several, and I mean SEVERAL emails on the measurements of my layout and how one could make their own.
Instead of writing the same answer to each of you, I thought it would be fun to make a liitle picture template to show you how I do it.
You do need to have Photoshop, Paint Shop Pro, or another artsy-fartsy program where you can set your image size and the amount of pixels per inch.
The photo is clickable so you are welcome to see a larger version of it! I always love to see what you create so don't hesitate to show me your backgrounds!
Let me know if you have any other questions! I'm happy to help!