I read it as AA talking about switching strategy, not just "mixing it up". If it's the matter of trying to adopt to a new strategy altogether, then my advice would depend heavily on where you're at now and where you want to try to go. If you're playing tight/passive currently and want to be more aggressive, there are ways to work on that, and if you want to play tighter, there are ways for that.
Or if you want to just switch styles to learn from it, that can be done too, but I'm not so sure I'd recommend it. For instance, let's say you play tight/passive at the moment, but you're willing to pay the price of higher risk by trying out a loose/aggressive style for awhile: I wouldn't necessarily recommend that, even if you might learn a thing or two.
See, you probably play the way you do for a reason, and unless you've trimmed yourself to be tight/aggressive, that reason is that your current style fits whatever motives you have for playing. Radically switching styles may not only cost you money, but may be so counterintuitive to you that you won't learn from it anyway - because you just don't have it in you to be loose/aggressive, and so you only pick up the "bad" parts of the play, and miss out on the upsides.
Anyway, if you clarify what kind of change you're thinking about, I'm sure there are many here who can give you tips and pointers on how to best go about it.