Meditating on Muladhara, located at the base of the spine, while visualizing a disc of spinning ruby red light is a good starting point. Focus on a smooth rotation of the disc and feel your connection to the physical Earth plane. Using the color red in your surroundings is also helpful. Burning red candles, hanging a predominantly red piece of artwork, wearing red clothing are all simple ways to activate the Root Chakra. Wearing a favorite piece of jewelry made of Carnelian, Onyx or Black Obsidian can give you a focal piece to meditate on briefly throughout your day.
You can also burn candles or incense scented with myrrh, patchouli, rosewood or balsam. Savory foods seasoned with thyme, clove and pepper can also help to activate Muladhara. A relaxing bath scented with vanilla and patchouli can be the perfect opportunity to meditate on Muladhara and feel the grounding effects of the aromatherapy.
Once again, YouTube is a great resource for frequency attunement audio to use for vibrational therapy. Sonic Harmonic provides some of my favorite attunement tracks. The video is great but the sound alone provides the frequency needed to attune your chakra. It's not music but rather tones that are tuned to the vibrational frequency of the chakra. Try this one out for Muladhara:
When I listen to these attunement audio segments I can actually feel the resonance of the vibration in my body...it's very cool!