I decided to use bubble wrap as my method rather than the theme. I made a background on an A4 sheet - using Fresco paints Inky Pool, Sky and London Night. I had two sizes of bubbles!!
I also spritzed it with blue patina perfect pearls spray.
The background on this card is Wendy's bubble stamp, the sentiment one of Tim's.
Best of all is I've still got a large piece of the bubble wrapped paper to use for something else - it's going on the scraps pile!!