Regarding your title the grips that come to mind are the "Mushroom" style grips. Super cushy and come in colors.
Plus they are era correctish, well at least they were on BMX bikes bitd....looks like you might need to lose a few links out of that chain? Does the chain mesh correctly with the rear cog? What's your plan for the display which is large and ugly but necessary for the TS to operate? I like how the tire is pre-flatted it will give you good practice on fixing flats as you will probably be getting your fair share of them with those wheels and the streets of Hells Kitchen. Or maybe they just need air...have fun with it and good luck. Don't forget to post the after picture.