Just sent off my May postcards for my colors monthly postcard exchange. The colors this month were "pastels," and I had a really hard time with using softer, less saturated colors! I think the colors I ended up with are just on the edge of what would be defined as "pastel."
Each card used a different French postcard back, from a really cool batch I got on eBay, and for the first time I added a few sequins and beads, with a LOT of glue, and they seem to have made it through the mail just fine.