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I just create a new file in PS sized 12x18, copy in my 12x12 finished layout, and then copy in either 3 other pictures or 2 additional copies of the 12x12 layout and use edit>transform>scale or crop to adjust the sizes as needed to fit within the 12x18 space.
Based on my experience (from rhapsdy's comment below), the critical step in printing at Costco is making sure to instruct them to turn off color correction. I have had them print 12x12 layouts, as well as 12x18 layouts and they have all turned out great as long as color correction is off. As Jellybeanie says below, if you have a few extra minutes, it's worth it to fill the whole 12x18 space. You're already paying to the develop those extra 6" so you might as well fill it with pictures!
Hope this helps! brigid.
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