Welcome to the board from Southern California! You have gotten lots of good advice.
If you have already cut it, do not wash until it is all put together.
I love the "crinkled" look as well. I do not pre-wash any of my fabrics and use Warm and Natural batting. I have found that the more quilting on the quilt, such as a free-motion all over as opposed to just diagonal lines, it crinkles up more. I toss them in my front loader washer with some detergent and a couple color catchers and an extra rinse cycle, then into the dryer on a "casual" setting.
I have made over 300 quilts and have never pre-washed and have never had a fabric bleed into another. I buy better quality fabrics and always use a color catcher, which sometimes comes out colored, but have never had an issue of the color bleeding into another. But I have not used a deep dark red or purple next to a white either.
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My newest Grandson, Caleb Austin, was born May 29th. I am now Grandma to 4 precious babies. I am so blessed!!!!