Just finished trimming my Liberate Your Art Swap postcards. I used a couple of my old collage prints and the others are from my photography days.
I went DIY and printed my images on matte photo paper and mounted them on card stock that I’d printed with my info, a quote (two different ones on creativity; one from Andy Warhol and one from Ray Bradbury) and some flourishes. They didn’t come out too bad though this isn’t something I’d want to do regularly or on a larger scale. It’s something better left to the pro printers.