Thumbs-up Research (2009)
I did game design documents and gameplay mock-ups and GUI icons for a company.
Here are some of the asset examples.
Picture 1. Game logo idea
Picture 2. GUI elements in use - version 1
Picture 3. GUI elements in use - version 2
Picture 4. GUI elements in use - version 3
Picture 5. Mock-up 1 - high-end version wip
Picture 6. Mock-up 2 - high-end version
Picture 7. Mock-up 3 - low-end version