Cathy G put a great image of 2 blue bottles on her website, and I thought they had a certain queasiness about them.
So I could not resist trying to paint one of the many stinging coelenterate 'bluebottles' washed up on the beach at the weekend. I brought one up to the house in a bag full of sand, as I didn't want to be stung ... the main stinging tentacle is some feet long! I put it to wash in fresh water with salt, where it immediately shed a huge quantity of blue stuff. It was already dead, I'm sure.
Not in great health anyway, because after trying a couple of watercolour portraits, it smelt so bad I had to go and pop it and bury it!
For the sake of the record, but not posterity, here's a photo of my terribly bad efforts, and the model. Not such a great idea after all!