Haven't seen anyone post this yet so I thought I'd share. Car Mate has prius C specific parts that I thought were pretty cool. They took advantage of those useless storage bins and made a right side arm rest and what looks like a trash can. They also have an assortment of other cool things.
you should note that in Japan that part is actually for the driver but its going to sit on the passenger in LHD cars.
you should also note that the car in the picture is a PC1 and I am wondering about the fitment with our current center console.
It almost also looks like the trash can thing is angeled to meet the center console... Ie it may not work with LHD