3M makes a bunch of adhesive backed vinyl that is as reflective as a street sign. You can also find scotchlite stuff that isn't quite as reflective as the OSHA standard stuff, but basically everything is based off of adhesive backed vinyl. Just buy a huge roll and learn to apply it. I'd say your spokes are the worst things to make reflective, because they're small and move faster than anything else but the rim and tire, yet aren't a continuous surface in rotation.
I made some logos out of scotchlite vinyl and they turned out great, but if i was trying to get bright i'd just cover a whole frame in the stuff, and maybe even make a ghetto disc wheel as per the hardcourtbikepolo diy.
3M Scotchlite, but it's a manufacturer commodity trademark and is included in many different products. Kind of like Gore-Tex, it's a technology trademark that is used in lots of different fabrics in lots of different garments, Scotchlite is used in many different materials and utilized in lots of different products. It's just that you're better off with vinyl that says
Scotchlite High Intensity Grade 2870 and 3870
or 'engineer grade' or whatnot. here's a random website explaining some of the types of products on the market: http://www.trafficsign.us/signsheet.html