In the presets screen, long press on a preset and select delete.
Note: factory presets cannot be deleted or changed
In the background screen, long press on a background and select delete.
Note: factory backgrounds cannot be deleted or changed
A good place to share your presets are social networks. There is a designated Google+ Wave Community for general discussions and sharing presets.
You can only have 50 Presets in your App. If you want to save more than that use the share functionality to save the images/links to another place.
Good places would be:
No, There is no possibility to set your own background image at the moment.
Please send uns an e-mail or post to the official Google+ Wave Community
All old presets are saved to the online-repository which can be accessed from the preset screen (upper right corner) or directly : http://paperworldcreation.com/wave/browse_presets/ -> click on show all. The first entries will be the old presets.
Wave presets are shared as images. You probably have set a standard app for sharing images, that opens when you share a preset. To reset these standard settings
Wave uses a custom url to encode the presets. Your browser does not support custom urls, try using Chrome instead, or you set your browser as the standard app to open these Wave presets. If that is the case you need to reset the lauch defaults for your browser:
Set a different background and reset Wave.
The background preview is dyed in the background color set in Colors > Background Color select a different color to view the differnt background-types
Make sure you uncheck automatic background color and background gradient in the color settings.
You probably have a color speed setting of 0. 0 means no change