Wow great bubble!!Very incredible things in your gallery!For my baloon, it's simple: Create a spheric shape, paint into this shape like on your "blue bubble ship" with the correct lighting, and add on it ,in overlay, a texture of plastic cover of a scaffolding ( [link] ). After that, paint over the baloon to create some details like cables and scratches...Hope you can understand my ugly english... XD Tell me if it's clear!Thanks for your message!