Here is my 4th, and last entry for the current CAS-ual Fridays challenge.
For this card, I again used nail polish. I put some nail polish on the card, and then turned the card upright so the nail polish could run. After I let it sit like that for a bit, I splattered some more nail polish on top of it. After it dried some, I added a piece of white cardstock towards the top of the card to cover any stray drops of polish, and added a strip of blue cardstock and a sentiment.