Yes, you can paint pampas grass to achieve custom colors for your decorative arrangements. To do this, choose a high-quality spray paint or floral spray dye in your desired color. Ensure that the pampas grass is clean and dry before starting. Hold the plumes upright and apply a light, even coat of paint from a distance to prevent over-saturation. Allow the painted pampas grass to dry completely before using it in your decor. This technique allows you to personalize the appearance of pampas grass to match your decorative theme or color scheme.