338: Eat without using your hands
339: Drink without using your hands
340: Snatch food from other peoples plates (or forks)
341: Coalesce water from air (might take a while)
342: Stop bleeding (depends on degree of injury)
343: When hiding underwater, create a tube of air to the surface so you can breathe. No reed needed.
344: Send those annoying flies into your companions mouth.
345: 'Cleanse' smoke or deadly vapors from air, so you can breathe
346: Help keep yourself warm or cool when traveling through inhospitable environments. Would probably help greatly with survival checks.
347: Maybe condense oxygen levels in the air you breathe for high altitude environments to help combat altitude sickness. Might require prior knowledge of oxygen or a lot of learned experience with prestidigitation. Actually, this could help in any environments for checks to continue running.
348: Gold and platinum have similar density (actually platinum is a little heavier). Disguise your gold as platinum.
349: Mess with a merchants scales to get a better deal (or validate fake currency).
350: Make your natural 1 a natural 20 (some GM's might accept that creativity, once)... Or just influence dice in character.
351: Slip poison into your enemies food or drink, from a distance.
352: Slowly fill your faster companions backpack with sand, when he's not looking.
Note: One of the problems about posting to a 1001 unique uses thread is that you don't know if your post is unique without having to read through the rest of them. It only gets more difficult the more posts there are. I myself was only able to read through half of them. Guess it doesn't matter much in the end :).