Sorry to have been Missing In Action again, but life has been really stressful and busy, and blogging and visiting blogs has taken a hit as a result.
The card is what was swapped, not the nail polish - the nail polish was used to make the marbled background.
I followed a couple of You Tube tutorials here and here - the main hint I would give is that this technique is best done outside, and that the paper is left to dry outside too.
I used water colour paper for the marbling, and found that when I went to emboss on it, the emossing seems to sink into the paper, and is not as raised or shiny as on plain card.
I kept the card simple to show off the marbling, so only added a matching organza ribbon and a few flat back rhinestones
Here is a shot showing some of the shimmer and shine the nail polish gave
I am linking this to: