Found this while searching
MOTORCYCLE BIKER HELMET STICK ON SPIKE STRIP MOHAWK LONG CENTER SPIKE | eBay
should frighten the jaywalkers.
Thanks Teri, I've found suppliers of T section trim and D section conduit that will do the job, also stick on chrome trim which could be used without painting, all available for pennies. I was a scientist in a previous life, so a little experimenting is in order I think.
Also I must thank you for starting this thread, it came at a very opportune moment for me.
Regards
Pete.