Yes, Ganesha is also associated with the Muladhara Chakra as since Ganesha is associated with new beginnings and opening closed doors.
A while ago, I was smoking some weed with my roommate and I was just blazed. I could feel my energy currents all around my body and I was seeing things. So, I sat up and vibrated the seed mantra, Lam. I did it once, immediately I felt my Muladhara Chakra reacting to the vibration.
My wonderful teacher, Dr. Google, teaches me these things.
My meditation is fairly simple but lengthy and it’s tailored for working only with the Muladhara Chakra. This is the best site I’ve found so far about hand mudras: http://www.langkawi-yoga.com/blog/?p=1109
For the meditation, here is the step by step process. Two terms you need to know. When I say to chant the Seed Mantra you should know that it is Lam and you chant this on the out breath while the in breath is through your nose. When I say to breathe the apana vayu you should know to exhale sharply while taking a longer in breath.
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First of all, get in a seated position where your rear end is touching the floor/ground/whatever surface your sitting on. This is so that your chakras can gather energy from the earth. Also, clench your anus, this is called the Mula Bandha (Root Lock). Ideally you should maintain it for the whole exercise, but that takes time and practice. Even maintaining it for a few chants of the seed mantra for every mudra is enough.
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Start in the Brahma/Poorna Mudra (number 5 in the website) this starts prana moving all around your body. Breathe the apana vayu ten times. After that chant the seed mantra for about five minutes. Don’t actually look at a clock, just intuit it.
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Move into the Merhu danda Mudra (number 4) this starts to centralize the movement of prana to your spinal column, which is where the chakras are. Breathe the Apana Vayu ten times and then chant the seed mantra for five minutes. As I said earlier, don’t time yourself, just intuit.
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Move into the Chin Mudra (number 1) this focuses prana below the navel to the feet. Breathe apana vayu ten times and chant the seed mantra for five minutes.
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Move into the Prithvi/Earth Mudra (number 6a) this builds up the earth element in your body which the Muladhara Chakra is associated with. Breathe the apana vayu ten times and chant the seed mantra for five minutes.
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Move into the Apana Mudra (Number 7b) this helps the movement of Apana Vayu in the body. Breathe the apana vayu ten times and chant the seed mantra for five minutes.
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Move into the Muladhara Chakra-Bhu Mudra (Number 8a) this activates, purifies, and empowers the Muladhara Chakra itself. Then, again, breathe the apana vayu and chant the seed mantra for five minutes.
Calmly leave the meditative state.
If you have any other questions I could definitely answer them.