I found this awesomely gorgeous butterfly wing mani while surfing the net and realized that this would actually be pretty simple to replicate. So, here's my tutorial...
I believe this might be China Glaze in Strawberry Fields.
Step 1: Paint your nails one vibrant solid color (or you could even using multiple colors), a few coats may be required to cover the nail, and let the polish dry completely (I did this a day in advance so my nails had time to dry and harden).
Step 2: Using a black Sharpie Marker (I find using a Sharpie is the easiest route) create the black wing outline (see image above for additional help) and allow to dry (tip: if you press on the black with your finger and it doesn't smear onto your finger then it's probably dry).
Step 3: Using a nail dotting tool or a toothpick dab on a few dots of white polish at the end of the nail and allow to dry.
Step 4: Apply a clear top coat, let dry completely and you're done!