Foiled glass involves putting foil underneath the glass while making the bead (logical.) Other colors can be added or layered and the end product is a bead which glows. Lamp working the bead involves manipulating the already hot glass, adding colors, or textures, or swirling it around.  
Image 1 is a little square glass foil bead in jewel tone foils, with black striping. The first image is a two part earring with a small malachite bead coupled with a black glass free form bead.

Foil and more 2