There was someone on either this board or the old ClubVMag board that had his Torx bolts chromed. I remember seeing some pics. Some other members have placed metallic vinyl circles over the head for a similar and less expensive effect.

I've had small parts successfully chromed using a company called chrometech:
http://www.chrometechusa.com/
You place the parts on a temporary "tree" and the entire tree is chromed - it cuts down quite a bit on the expense. However the technique they use isn't recommended for exterior parts.

-- John