The meditation tools provided herein work for me. That doesn't mean they'll work for you.
Meditation is, by definition, simple. You don't really need much, if anything. Simply sitting quietly is meditation. A walk in the park is meditation. But, for me, the aim of meditation is to really slow my brain frequency, and shut down the beta frequency; the chatter, or "monkey mind." For this, I find certain auditory and visual cues helpful. A Sri Yantra (see above) is a very powerful visual, but a lit candle will do. Tibetan bowls make a nice, soothing soundtrack, which offers the added benefit of having no easily memorized and anticipated melody. I also find sitar music very powerful. My mother had a live Ravi Shankar album that I practically wore out, in my youth.
Probably the most effective and targeted meditation music I've come across is from Master Charles Cannon and his Synchronicity method. His website is back up, after being taken down following the tragedy in Mumbai, which resulted in deaths and injuries of some Synchronicity members traveling there. Master Charles is both a mystic and a musician, whose audio tracks are designed to very quickly move the brain into a primarily alpha, theta, or even delta brainwave pattern. His website offers some sample audio tracks, as well as an online meditation room, providing an assortment of music tracks and a moving mandala presentation. I highly recommend taking advantage of this experience, which is free on the Synchronicity site. I've listened to a lot of high tech meditation audio, through the years. None of it has impressed me like his. It does exactly what it says it will do.
The use of scent can also be very helpful. By this, I mean natural scents, not chemical fragrance. Essential oils, resins burned on charcoal, or prepared incense made from only natural sources. The primary meditation scents are sandalwood and frankincense. This is because they slow the breathing and heart rate and assist you physically into a meditative state. Again, this physiological response can only be achieved by the use of high quality, natural sources.
I share these tools now, because finding and holding our center is of increasing importance as we undergo the current global changes. Enjoy.