My cats love pushing a ball around a little track.  They also love catnip.  And not too surprisingly they also love to scratch stuff.  This covers all three bases nicely.  I've several toys of this nature scattered throughout the cats' royal palace and this one gets played with on average twice a day.  I have this one in my office - just across from the bed room.  And night or day they play away pushing the ball in it's track, stopping it, sending it back, and starting over.