I keep all of my Holiday fabrics separate from others.
My FQs are sorted by color; I keep boxes for 2 1/2" strips. I used to separated them by color in with other same color scraps but decided keeping all 2 1/2" strips together makes it really easy to grab when doing strip quilts. Other scraps are in separate containers. I do have separate boxes also for each size squares, ie 3, 3 1/2, 4 and so on up to 6 1/2".
Then I just added new shelving for larger pieces and have them separated by color. I've folded them so that they are approx 12" SQ. When I want a particular fabric I can pretty much tell at a glance how much is there by how many times it's folded. I had a photo of my closet as my avatar for a short time. It took a long weekend to get it this organized but it was well worth it.