I've been collecting seeds too. I have heirloom tomatoes seeds drying now on plates. I took a bunch of seeds from a super tall two-toned pale pink/burgundy center hollyhock, lady in red salvia, coral nymph salvia, Yvonnes salvia, Coronado hyssop, red okra, Tarahumara popping sorghum. I'm sure I'll gather some other seeds too this weekend.
You guys have me thinking about zinnia. I really loved a new zinnia this year called Queen Red Lime, but I'm thinking that it won't come true from seed. I could always give it a try.
I saw a post for garlic chives and for shiso perilla. I've never had to collect seeds from them. They grow back reliably every year for us. I have collected them for swaps though.
I used to love the piggy swaps on DG. I still have a closet full of seeds!