It's One Layer #59 time on Susan's blog, and the inspiration this week is so so pretty. Be sure to take a look and play along.
I've always been a big fan of silhouette images - they're so versatile, and although they're usually black of course, layering the inked images gives a little extra dimension and technically adds another colour because of the overlapping of inks.
If I don't have a button in the right colour (which is not often, as I have +++ buttons!), I make my own from cardstock, a circle punch and Dimensional Magic, like this green one.