I used some organza ribbon and gently pleated it and fixed it to my card with a tiny stitch in each pleat.
It adds a wonderful dimension to the card - in this case it acted as water for my crab. I also added some faux water droplets and some bling swirls. The actual crab is pre coloured and can be obtained from Doodle Pantry.
Pop on over to Practical Scrappers and have a look at all the wonderful inspiration from the other DT members on how YOU can add trim to your next card!