https://www.amazon.com/Nail-Art-Decals-Decorations-Accessories/dp/B07LH2Z6PV/ref=sr_1_28?crid=ISIBT8276NJS&keywords=waterslide+decals+for+nails&qid=1647801824&sprefix=waterslide+decals+for+nails%2Caps%2C83&sr=8-28

this is just one example. if you search for "waterslide decals for nails" on amazon you can find a ton, even some metallics. The packs will likely have a bunch you may not want, but they're cheap and effective.