I agree with the several others mentioning that none of these choices are choices I would purchase, or have purchased on shirts in the past (a total of 38, mind you).
Obviously this is a test run to see how many people bite the bait, but realistically, since art is subjective to each person, you can hit or miss very easily based on your demographic for specific designs.
Again, I am not one of those in your demographic this week. Hopefully this isn't the ONLY (sorry, no italics are available as I'm responding on my phone) week you're doing this, because I don't see you having so many new and different medium choices if it is, only to take them all away.
If your goal is to keep people happy, feature independent artists, and/or turn profit, then it'd be in your best interest to open up the entire line of designs (with the artists' permission, of course, unless you make the artists sign an agreement stating that you reserve the right to do what you want with their designs if they win), and to allow people to choose their own five-packs.
Clearly there's a creation of demand, here, though. But also disappointment for the large group who isn't currently interested until your beta testing has the bugs worked out. This is why I'm providing feedback in the non candy-coated fashion that I am. Please don't misinterpret it. I only wish to keep all parties content: me, as a loyal consumer first, the artists (especially those who were not featured), as they are the main reason you are successful, and you, Shirt.Woot, because nobody wants to see you disappear or find some other career in the form of underwater basketweaving or the like. ;-)
If this is art truly worthy of display on locations other than the human torso, a choice of different finishes would be ideal. Not to steal any ideas, but the largest successful art community which-shall-not-be-named (although is quite 'devious'...) which relies on user submissions such as yourself, allows for prints based on the consumer's choice in glossy, matte, or lustre.
Perhaps this is too much to ask for at first, as this is a new learning process you're getting your feet wet with, and I understand that it's usually steps at a time. However, I am indeed 'the discerning art critic' you mentioned in your mass email. I'm sure there are others who have to agree with at least parts of what I'm stating, and we would love to see you run with it, being successful while supplying the much-needed demand.
Again, please don't misinterpret my critiquing, but these had better not be the only choices for the only week you're offering this opportunity!
I send my regards. Great job so far, but keep it up!
I wonder if woot will put me on probation for this signature...
I guess we'll find out.