Hello again!
If you're printing greeting cards, are you planning to just glue the photo on the front of the card, or to print the entire card?
Either way, this photo is looks very nice all framed as you have it, but it is not in the the right proportion to print 2-per-page borderless OR borderless as a greeting card with double-sided paper. Picture Package assumes 8x10 for the final composite print rather than 8.5x11, so it will never fill the page even if you change the proportions on your photo. Because it's taller than a normal 5x7 photo, with Picture Package it will print 5x6.4.
21farms gave you both of the best methods regardless of whether you print two photos per page (for gluing) or one per page (to use as a card). Unless you're also providing the envelopes, you need to find out what size envelopes are going to be used for the cards, then make the photo/card about 1/8" to 1/4" smaller.
I have a lot of envelopes in red, green, and white that are all made for letter-sized sheets folded in half. To make my cards, I use double-sided (matte) paper, print both sides, fold in half, and insert in the envelopes. If my envelopes were smaller, I would figure out the proportions I needed, print both sides, fold the card, then trim to fit the envelope.
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Tricia
Minolta Dimage D7(UG), Epson 2200, PBase supporter