Here you are, a simple layered Photoshop template with space for 4 photos. It’s 12×12 and, as always, 300dpi etc. In the Photoshop file you’ll get both rounded corners AND straight corners as follows:
If you make any layouts using my templates, email me a copy (saved around 600px) and I’ll post them here!
OK, it’s late so I’ll call it a night.