yeah sometimes i use trees too, god bless those friendly green giants (IMG:
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and sometimes, if i feel the need to ground myself in a crowded area, i visualize my feet being roots, and all the energy that is negative travel down and out of me through my feet. it works quite well, i usually feel much better.
another grounding technique that i use in the astral when i am feeling stressed out (quite unconsciously sometimes) is falling backward, or swinging motions or
stretching myself out. flying sometimes helps, but usually its the stretching and falling backward feeling that realigns my energies and enervates me the best. i am much healthier and i sleep better when i do this.
physical activities that seem to help are gardening, swimming, singing, archery (the focusing your mind on a narrow and fixed point, and releasing your stress when you let go of the bow and to let it travel through the arrow to split the air and hit your target to transform from something negative into an action that is positive and useful...teaches patience, aim and balance, and focus of your will power), playing with and training dogs (or animals in general, it just so happens i have a big connection with canines), and exercise. EXERCISE grounds like a mother....
rubber bands on the arm (which you snap from time to time, to bring you out of your lala land) work too. Touch that is not sexual generally grounds me. heightening my awareness of the sensation (not just mild pain, but taste and hot and cold as well) brings me to Earth.
i find wearing metal tends to ground (as long as you cleanse the metal)...on that same note, i always remove metal when i am trying to do magic or rituals or healing.
what do i feel like when i am grounded? more than lucid, generally content, logical, alive but small, comfortable in my skin.
but if i feel bigger than my skin and i am oversensitive to people around me or i am daydreaming or jumping to conclusions a lot or i feel inebriated or overwhelmed by my surroundings, and if i am getting a lot of cravings for junk food and self destructive or risky behavior, i know it is time to ground myself.