Beans loves plastic bags. They all absolutely adore their kitty light, and Brynja and Bownie also love those "feathers on a stick/cat ticklers".

The Beddy Bear, Jade, loves to chase strings where I tie knots at the end of it, and Boomer loves gadgets and those little plastic containers inside Kinder chocolate eggs (I usually put a couple of kibbles inside to make it make noise + he always end opening the container when chewing on it = there's an extra surprise).