Those colors would work in the labyrinth - you need high contrast in the frames so you'd likely need to add another light gray and maybe even white.
If she tends to lead toward the more modern quilts -you could draw out large rectangles of the colors, thin border them in black (like 1/2" finished) , turn them all directions. I've also seen one of the Turning Twenty Just Got Better that would rock those colors -
http://www.friendfolks.com/store-detail.php?cat=2&ID=11
You could also do the HST's
http://ricochetandaway.blogspot.com/...-tutorial.html
or a carpentar's star
ok enough from me!