I happened across the Moon Sugar Decals site and scrolled and scrolled through all of the fun and different water decal options. I hadn't heard of the company before seeing this mani from Lace & Lacquers. I wanted to give them a whirl myself. I was pretty excited to mess with the St. Patrick's Day offerings. I do happen to be a Murphy =D.
For the base I did a St. Pat's ombre using China Glaze Starboard, Dandy Lyin' Around and Life Preserver. Two coats of each (one coat where I did the gradient). I was surprised to see the decals were supposed to go into warm water as usually it's room temperature.
The only images that gave me trouble, were the circular shamrock images. They didn't really lie flat, but to be fair, my index nails are extremely curved. With two coats of Sally Hansen Insta-Dri - they have remained flat and clean in terms of the images. These decals, and more than 120 other designs, can be purchased directly from their site for $3.99 a sheet. They also have the option to create your own custom image on a high quality decal (not that eBay junk).