These round robin cards are ones where I was the third player - so all I have to do ("all", lol) is figure out how to finish the card. The lizard cards I loved - some of the best ones I've received recently - and I didn't want to ruin them. So I stitched some interestingly textured yarn on them and stitched a border - they came out really well, I think.
These were a little easier to do as I wasn't as afraid that I'd wreck them. I added the washi tape at the top and a tea bag tag (which isn't fixed down, it swings).
And with these, I just went for my go-to: a word. And a flower, in this case.