Someone on facebook found this cool video of making a "suspension base" for glitter polish with just some clear polish and xanthan gum. The wikipedia page for xanthan gum does say it is used as a stabilizer in cosmetic products so who knows, maybe this is how real suspension base is made. I have yet to try it but there are other youtube videos where people have used it to thicken their nail polish for stamping and that seems to work. I don't think I'll be trying this yet. I will check my local whole foods place (not actually Whole Foods, just a hippie food co-op) for xanthan gum and see if they have it. If it is inexpensive, I might buy some. At least if it doesn't work for making suspension base, I could totally use some for making Fauxnad polish for stamping.
If you have used this method, let me know! I'd love to hear how it turns out.