Making "Personal"
None of them turned out to be good enough to make into a card, but the basic idea was proved. So we went out for another photo shoot and took perhaps 50 shots of the boys. On our way back we just happened to pass another similar sign and just for grins we took a few more shots. The absolute last shot of the day just happened to catch the two of them while they were laughing at each other.
At this point, to get a custom image it was "merely" a matter of rotating the image slightly to get the lines to be horizontal, editing out the text, etc. Oh, and creating a font that could be rendered white-on-blue rather than the black-on-white of the Church Sign Generator.