Tool Box Cowl is the perfect way to experiment with colors. A pack of mini skeins (such as Katia Ombre or Frabjous Fibers) would be perfect!
312 yards total are needed of fingering weight for the regular cowl; 6 colors are what the pattern calls for but this could easily be adapted to 5! If you wish to make the longer infinity cowl length, instructions are in the pattern for a longer and wider version using 130 yards each of 6 different colors, 780 yards total.
Classes support yarn purchased at Amazing Threads.