The wedding gift I still have and remember the giver is a SOLID wood cutting board. Have no fabric items from wedding gifts. I did receive things not on my registry. Most of those didn't fit my choices & exchanged all I could.
Being a quilter and 2D visual artist, I like to give something I made. I do some investigating as to their style and color preferences. And give something that isn't intended to be a focal point (bed spread, large wall hanging). I like the picnic idea. Also a table covering might be nice. The casserole carrier sounds good. Add some hot pads or insulated table runner.