Anything sphere or egg shaped could be repurposed and a Dollar store is chock full of materials if thinking abstractly. Even a plastic party champagne cup could be repurposed.
There's lots of random goodies there too. I used a little plastic hoverboard toy thing that had four fans inside a piece of terrain and it turned out most excellent, especially for $1.
I also grabbed a tiny dollhouse that had a schweet Necromunda sized couch, sofa and coffee table that is waiting its turn at becoming some sort of scatter terrain.