I've gone back to a card I started making for the first day - Lizzie's stitching challenge.
The first incarnation was black and kraft only. Very elegant but rather dull for a birthday card. Also very messily stamped so I threw it away (d'oh) and started again, this time using tropical teal and alluring amethyst inks.
This challenge made me pull it back to my desk and look at it again. I decided some dimension would help it no end, so I got the square nesting dies out again.
Popping a couple of the elements up has made a huge difference. It's still clean but more visually interesting.