The colorful one would be in the "quilt top" catagory? Definately enter that one. For the pieced... the sampler. For the group I am sure that no one would mind their blocks being entered!
I have only entered 2 quilts in a county fair, many, many years ago. How long ago is that one of them was in the catagory of "Quilter's First Quilt" and I won first place. The other one, made for my sister, didn't win anything but hey... I was new at it too.
In any case it was such a thrill to go to the fair and see MY quilts hanging there for everyone to see.