Get a few cheap manual flashes, some cheapo radio trigger and go to town with your kit... I hated flashes more than anything for the same reasons most people do... doesn't look good, looks un-natural, exposure is weird etc.
But once I started playing with off camera flashes, boy did it opened a bunch of new opportunities. Using softboxes and the such will take the harshness away and setting your flash power levels for the exposure you want instead of setting your exposure according to the flash power level will make the exposure a lot better. Managing where your flashes are and where the light is going will ensure a more natural looking effect. A little tweak of your white balance and it'll take the coldness of the flash away.
When thinking of flashes, most people think of flat looking, white faced/red eyed, over-exposed subject with under-exposed background (like you 8yo birthday polaroid picture your mom took, where all you can see is how white your ceiling is and how much blood there is inside your eyes). Which is kind of what you get with the pop-up flash... Harsh, white, lens level, in your face blast of light.
Constant or natural lighting is simple and a lot easier to work with. Using flashes is harder, might take a few shots before you get what you're after and it is one more thing to deal with. But it is also one more thing the PLAY with
I love flashes. I love constant lighting, I love natural light, I love the golden hours, I love light... I just love photography. The more stuff to play with, the more fun I have.