Congratulations, MamaMay! I'll be e-mailing you shortly to discuss the details of your free roving.
Reading all the responses has been very educational. My main reference book on dyeing roving, to date, has been Color in Spinning by Deb Menz. She states that color stripes should be 3" wide at the most, and that roving should be dyed in increments no greater than 1 oz to make it easier to handle--definitely not what spinners seem to prefer. And when I browse on Ravelry, many dyers seem to be quite worked up about how braiding and shipping in polymailers lead to fiber compaction. It's been interesting to see how spinners, at least the ones who entered the contest, are less concerned about that.
If you entered this contest, thank you so very much for your input! I thought this was really fun--I'll definitely be doing more contests in the future.