These can be fun as-is, but if you make a circular track (without hills) and put hexbugs (or the robotic ladybugs) in them, they'll go around the track.  They're a lot of fun for cats to bat at through the covers and can help take cats' focus off of each other and...

I'm super bummed that it's so hard to find Hexbug Nano robotic bugs now!  But there are these ladybugs that look similar.  Try putting them in any track toy, a box (with other rolling toys, treats, or more ladybugs), or any type of container your cat might like to use...

The Cat Dancer is a classic toy that dangles five little paper rolls on a 30″ wire, simulating the movements of a flying insect. Most cats have fun batting at it since it moves somewhat randomly and unpredictably.

If your kitty likes snakey toys, this is for you! Also good for cats who may be intimidated by more quickly-moving wand toys. Can also help cats with getting used to being touched using the soft fleece end.

This is a feather that moves at variable speeds/patterns under a circle of fabric, which cats love!

If your cat enjoys water, give these robot fishies a try! They even light up with flashing LEDs and come with extra batteries.