These almost look like a heart water marble but they were much faster and less messy. I've used Konad Polish several times in black and white but am just now getting into other colors. There are other brands that will work... my favorite is Sally Hansen Insta-Dri but some of the lighter colors do bleed and aren't as thick as Konad.
The light pink color here is China Glaze Sugar High. I used Red Angel image plate RA-106 and Konad Special Polish in Red for the heart design. This manicure only took about five minutes because I just added the design over already worn pink nails :)