You can control how you feel, and therefore what you generate out into the world - it just takes some practice. A lot of people think that feelings control them - "Good things happen, I feel good; bad things happen, I feel bad." This may be true for them but it is not true. You have the power to choose what you generate within yourself and therefore out into the world. There are many practices that teach this art - the best (I believe) is T'ai Chi because it is all about feeling your way to feeling good, not about thinking your way to feeling good.
As Peter Ralston says, there are two energies in the universe - expansion and contraction. For me, feeling good is expansion; feeling bad is contraction. Expansion heals. Contraction destroys.
T'ai Chi, in its highest form, is about feeling good. T'ai Chi is the practice of expansion; it is learning how to lessen the energy of resistance so that everything flows. It is about getting out of the way so that the essential goodness of the universe flows through you. By the way, when that happens it is not some sort of impersonal, 'O I am a conduit for the universe flowing through me.' It's more like, "WOW, OMFG, Holy $%^! Does that feel GREAAAAAAT!"
T'ai Chi is dancing with wild abandon, excitement, enthusiasm, and passion - on the inside. No matter how old you get you never feel any older than when you were a child. Even my mom at 99, when I asked her how she felt inside responded, "Like a girl of sixteen. I can't do what I could then, but I feel that way inside."
This is the beauty of T'ai Chi - on the inside you can do everything you ever could on the outside, (and more - did you ever fly?) no matter how old you get - truly. T'ai Chi teaches us how to make that real, not just a theory.
I promise to keep these (relatively) short (have you seen some blogs? Wow!), so I will end here. Stay tuned for more on this very topic. I am on a roll and feel a lot of passion around it. Some how-to advice even.
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Visualize Whirled peas!