Hmm, I’ll hunt around for that guide.
From memory It listed specifications like pixel dimensions, layout and dpi, I think there was a link to the Ubuntu colour pallet, and a general guide to good design practice.
There was also best practice guidelines and general rules such as:
- Avoid political slogans and imagery
- No copyrighted images or Trademarks/logos. I think from memory Canonical required proof of license if background images were used e,g, should be an open license like CC.
- No offensive content
- Try not to lock it into a particular release, avoid release numbers or names.
- Links to popular Open source applications Inkscape and Gimp.
I can’t remember if the guide included tutorials and templates or links to them.
I’m sure there was more to it than the above, I will endeavor to find the original guide.