For this project I chose to showcase three manufacturers I worked with to test out their quality, durability and color accuracy.  The Anti Social Butterfly was a holographic sticker from StickerMule.  The Owl sticker was a pixie dust sticker from StickerApp.  The Chicken Nuggies sticker is from VinylDisorder.  I've had the best luck with StickerApp and VinylDisorder.  The holographic stickers from StickerMule seem to be almost too thick for my taste, but the quality is great otherwise.  I would recommend any of these three to work with.