Trying to create this look in buttercream:

https://www.google.com/search?site=&tbm=isch&source=hp&biw=1073&bih=667&q=gold+trim+flower&oq=gold+trim+flower&gs_l=img.3...1281.5216.0.5411.16.12.0.4.4.0.94.867.12.12.0....0...1ac.1.64.img..3.13.866.9vqzLpUNS5Y#imgrc=QNNNeecxSNWjTM%3A

The edges of the "flowers" are gold, while the flower remains white. I want to apply it to cupcakes, decorated with crusting buttercream flowers. Anyone done this? What product? Tips or tricks?

I have done it several times.  Trick is to wait until the buttercream has crusted then use a light bristled, thin brush.  I mix vodka with my gold dust then paint the petals using the side of the brush not the tip (sometimes the bristles fan out and give me streaks so I use the sides).  

I make my own buttercream icing so my icing crusts very well.  The dust I use depends on what color I am looking for and how deep I want the trim.  I purchase them here:  http://www.countrykitchensa.com/shop/ingredients-icing-colors-flavors/fda-approved-dusting-powders/46/752/2082.

Thanks Theresa. Which color dust are you happiest with for "real gold" color?

Wedding gold would be my first choice; it has a darker hue and looks more realistic to me.  The second choice would be super gold; nice hue but lighter and more pearl like.  Because these dust are edible, they are as close as I have found to real gold look.  Hope this helps a bit.

awesome! Thanks.... omw to grab some here locally