Change Unitframe health/mana bar background

[emiaee]

Hello,

I'm using classic blizzard unit frames but the bar texture (health, rage, energy, mana etc) I actually do not like that much. I do not wish to change my unitframes although if required whoaUnitframes type would be the most I would go to. However is it possible to somehow change the texture from blizzard default to something like Armory or xPearl texture for example? How do I do this? If possible can you explain and/or show me how to do so?

Thank you!