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I've admired Arp's photo collages of woodlice and ladybirds on this site. I'm wanting to have four 6x4 images, two up two down so to speak, on a 12x8 print with no space between the images or background. Each individual image is in the 3:2 ratio with the same size Megapixel dimensions eg 3072x2048.

I use Photoshop Elements an early freebie edition I recieved with a scanner. Is there an easy way of doing this?
I had a look at the Picture package option but this didn't seem to have the 'number of prints' and 'size of prints' combination I wanted.