I come from a Tibetan Buddhist background, so the framework I typically employ is the seven points of Vairocana. The Buddha Vairocana is often represented sitting in this posture at the center of a mandala of the five principle Buddhas. He is the lord of the buddha family, all white representing the wisdom of all-encompassing space, as well as it’s exact opposite, the very ignorance that is the driving force behind our cycle of suffering. He represents, in part, the idea that our ignorance can be transformed into vast spaciousness, which can accommodate everything. Not a bad role model, right
The simplest thing to do with your hands is to rest them on your lap. You can drop your hands at your sides and pick them up at the elbow then drop them palms down on your thighs. This is a natural axis point on which to rest them, providing better support for your upright spine. In his new book The Relaxed Mind, Kilung Rinpoche mentions that sitting with your palms down tends to relax the flow of energy throughout your body.
Alternatively, you can place your right hand on top of your left with your thumbs very lightly touching, resting them on your lap at your navel. Kilung Rinpoche has remarked that this creates more heat and energy in the body, which can be useful if you are feeling sleepy. Symbolically, the left hand represents wisdom and the right compassion. In this gesture you are bringing the two together.