If you like that kind of effect though, try some of the other materials often used for highlighting on polymer clay like mica powders (Pearl Ex, etc) or even real-metal powders (Mona Lisa, etc)...or even paints, inks, metallic leaf, etc! Lots of different looks and fun stuff to play with.
I actually do have some silver mica in a little jar that I have yet to do much with. I have only used it twice so far, which was to give a metallic look to: 1) a pie tin for a tiny mulberry pie and 2) the lid of a tiny cookie jar. Today, I'm making a picture frame, and for that I think I might experiment with the mica again.
Btw, do you know yet that you can make your own stamps (and molds) with polymer clay (and other materials) to use with polymer clay, as well as finding stamps to use? If not, you're in for a treat!
I did, actually; I have yet to do a lot of experimenting with it, though. The wine glasses on the green bottle were actually done with a pc mold I made myself. I made many attempts to carve tiny wine glasses, and finally I just got frustrated and made the mold. The fleur-de-lis stamp was one in a package of 6, so I will probably use those soon, as well. I really like them!
There are so many ways to do the general technique of mokume gane too...
I am quickly finding out that that is true! The bottle that just says "hope" can be considered a form of mokume gane as well (I think). I randomly layered torn sheets of different colors, covered it in white, and carved away the lines and letters with a Dremel. Probably the most creative thing I've come up with when it comes to clay!