Modifying Store-Bought Valentines

I got these cute robot-inspired Valentines a few weeks back. Unfortunately, once I opened the package, I found that the cards were square and didn’t come with envelopes. No problem – I trimmed down the card and mounted it on a piece of cardstock, with double-stick tape, that fit a first-class-sized mailing enveloped. I also rounded the corners of both the card and the cardstock with my new favorite crafting tool, the X-Acto Corner Rounder. The cardstock gave me room to write a long message on the back, too! Have you ever modified store-bought Valentines before?