Try Flexi-bit. They're made in the UK and come in assorted colors (pink, blue, aqua) and assorted snaffle styles. They sell in 5 1/4" and 5 3/4". I have no idea who sells them, though. I also think they're plastic-covered steel. Not sure if that's what you'd want.
OK, we've got the blingey ear bonnet, crystal browband, rhinestone encrusted bit rings, colored bit, diamante reins, matching (or contrasting) saddle pad, stirrups, and polos, colored whip with silver handle. What about the helmet?