I went with a simple Wrap-Around Variation for my Hufflepuff colors and a Chevron-style for Ravenclaw (I couldn't find any bronze thread that I liked, so I just went with blues, grays, and black, which are what come to my mind for Ravenclaw).
I decided to experiment a little with my Gryffendor and Slytherin bracelets. The Slytherin bracelet uses two different greens, gray, black, and silver. I used a modification of the Diagonal Wrap-Around style—I used the Forward Knot to go left to right, but when I got to my silver color, after completing my rows of Forward Knots, I started a new set of Backward Knots, then followed with my other colors. When I got to black again, after a full set of Backward Knots, I switched back to Forward Knots. It turned into a zig-zag pattern that makes me think of snakes and Nagini and Slytherin.