I didn't want to wreck my pristine and beloved rat fur, but I wanted something on the walls.  I thought of the old-style curtain hooks, and they worked out great!  I will take the pictures down while traveling as I don't want them pulling on the hooks (plus they might bounce off).  The hardest part of the project was finding little oval picture frames.  I thought ovals would be nice because of the curvature of the walls, but apparently they are not popular.  I envisioned some cheapo little frames but no luck online.  Happy Easter to all the Egg lovers out there!