Hi, Vamshi Krishna,
Thank you for reaching out.
The current implementation of the Spreadsheet component doesn't provide a method or configuration option that would allow you to change the predefined palette. As this is indeed a valid Feature Request I have converted this to a public Feature Request and you can monitor the status of the item here:
https://feedback.telerik.com/kendo-jquery-ui/1497440-change-color-palette-in-toolbar
We will continue monitoring the community interest in such a feature and based on the interest demonstrated we will consider it for implementation in an upcoming release of Kendo UI.
Please accept our apologies for any inconveniences caused by the lack of such a configuration option.
Regards,
Stoyan
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