These make great embellishments, either using two together (sandwiching a special flat item - baby's first lock of hair, perhaps?) or singly.

They can be stamped on and coloured (use permanent inks), attached to the front of small photographs, drizzled with embossing powders or just used to highlight one word. 

The easiest way to stick them together (in my opinion), is to tape double sided tape around the edges, dip them in a metallic embossing powder and heat!  They have that 'soldered' look and are very classy.