Hi Mihai Velicu,
Thank you for the question.
RadToolStrip is green by design. Should you want to customize the RadToolStrip Desert theme, you can do it in the old Visual Style Builder as the new one does not support RadToolStrip. Please refer to the following knowledge base article which demonstrates how you can start the old VSB in Q1 2010+:
Using the old Visual Style Builder in Q1 2010+. If we receive the same feedback from other users, we will reconsider the color scheme of the RadToolStrip Desert theme.
If you have additional questions, feel free to contact me.
Best wishes,
Nikolay
the Telerik team
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