Oh my goodness, these are both going to be beautiful! I love the colors you both chose.
I usally look at mine for at least a few days. I change it all the way up several times then look at it some more. Usually changing a block here and there to fine tune it. I always wind up going dark in one corner then fading to the lightest color. But mine are never big enough to do much more with them. Both of these remind me of the sun. The light one a sunrise and the dark one a sunset. The first one could go with the blue snaking down the middle and then the grayish to the dark yellow on the edges. I think the yellow fading from one corner to blue (sky) in the opposite corner would be gorgeous too. And oh boy, the second one has lots of possibilities because of all the colors. I would try the bright yellow in the center first but again, I would have to see it all in one corner too.
Just take your time and wait for it to grab you. You will know when it's right for you. These are wonderful ladies!!