This is quite easy to do. I used the brush tool, drew a quick sketch of some porky elephant; chose some colours and set them to transparent. Bob’s yer uncle. This was just a little doodle for my friend Liz who is working on the Elephant Listening Project at Cornell university, and is about to be sent to the rainforests of Gabon. She'll collate data for six weeks. [Rather her than me.. all those bugs and things that land on you in the night].