I agree big applause for ALL the hosting you have done for us LeighAnn-thank you so-o much!
Some other thoughts for themes could be mixed media, or working with specific materials like corrugated cardboard, chipboard, fabric, metal, acetate or specific tools like stencils, brayer, sponging (other than blending tool), paintbrush etc.
Will stamping be a basic requirement?
I personally wouldn't mind swapping if there is a limit on the Maximum Size...like small manila envelope....but certainly want to hear other's opinions too.