New Relic dashboards allow for flexible data visualization across various sources, utilizing pre-made templates, native platform visualizations, custom queries, and more. The latest enhancements include color customization options to highlight key information or match branding colors, null value settings to handle gaps in data, unit customization to improve clarity on charts, and a Markdown widget to add context and flair to dashboards. These new features enable users to create customized dashboards that cater to their specific needs, making it easier to analyze telemetry data across the entire stack.