They are now on Challenge 3 which is called "Blank Slate". They were sent 15 skeins of the beautiful yarn called KENZIE by HIKOO and could make anything they want. You can read more about what the entries will be judged on at their website.
I was able to get some of the same yarn, but in a different colorway (the actual contestants had to use a beige color). My colorway is called "Bayberry" and is a wonderful rich tweedy orange.
I decided to do a "sampler" sort of sweater and started with a simple form made out of rectangles for the back, sides and arms. I divided those up into smaller rectangles and made those with over 25 different lace and texture patterns with diagonal lines. I have recently begun experimenting with joining crochet and knitting in the same piece and did so on this. The body is done with knit motifs and the arms and front band with crochet.
Here are some of the crochet and knit pattern books I used to research and find diagonal designs: