I've gotten more and more into glitter nails recently, it's so easy and fun and I actually get to use my many loose glitters =) One glitter I'm particularly in love with atm is MACs Reflects Pearl. It's a gorgeous white/pearl glitter, very finely milled and looks awesome on the nails. Because it is so finely milled it's a lot easier to work with than other glitters I think (at least on the nails).
When you use it on the nails it really creates a clean sofisticated look but still fun as it softly sparkles. I love this look and if you have Reflects Pearl inyour collection really suggest you try it out on your nails =)