Printing 2-up from Photo Booth?

For my son's birthday I want his guests to make little passports and go through the house visiting destinations to get them stamped, etc.

I thought Photo Booth would be the perfect app for taking the photos, except that I can't figure out how to tell it to print 2-up or n-up on a 4x6 photo paper page. If I click a picture in the Photo Booth photo list, it dutifully prints nearly a passport-photo-sized image, but there is no way to select more than one photo. Printing 2 copies just prints one copy each on two sheets of photo paper.

Obviously I only need one photo per kid for the little passports, but it pains me to waste 90% of a piece of photo paper. Even if I could print 2-up of the same photo then I'd at least have an extra in case they screw up when cutting or pasting into the passport booklet.

The long way would be to import them into iPhoto, but that would truly suck and would take a lot of the fun out of the experience.

Is there a way to control Photo Booth's printing with any more options? I'd even like to increase the default print size a bit (currently 2.0" x 1.5").

The plist doesn't show anything obvious:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>AutoFlipPhoto</key>
<integer>1</integer>
<key>Compositions</key>
<array>
<dict>
<key>LastEffectIndex</key>
<integer>5</integer>
</dict>
<dict>
<key>LastEffectIndex</key>
<integer>6</integer>
</dict>
</array>
<key>LastComposition</key>
<integer>0</integer>
<key>NSDisabledCharacterPaletteMenuItem</key>
<true/>
<key>NSWindow Frame PhotoBoothMainWindow</key>
<string>187 50 650 686 0 0 1024 746 </string>
</dict>
</plist>