There are no useless superpowers.

Yes, the release of your eyebrow hair and whatnot wouldn't account for much, but the hair atop your head would. You would die from switching your skin in and out, and that brings into question the choice of it as a superpower, but since I stated "Any" ability humans can't do, it applies. But there is a difference between "useful" and "use". For instance, A divining rod is used to divine for water, but because water divining doesn't work, a divining rod isn't useful for finding water, even if it does have a "use". So defining a use for a superpower doesn't have to take into question the negative effects of the superpower, I am only obligated to list a use outside it's own application. But, to add one more, it would make a great Halloween costume! Pizza into Broccoli would be my choice. Although I don't hate pizza (who the hell does?) I do know that broccoli is far and beyond more nutritious than pizza, so it has plenty of use for extorting enormous amounts of money from pizza chains or they'll be selling boxes of broccoli. I would probably ask for pizza for life! I can eat like a horse and lift weights for several months straight and not gain a pound, but that's not a superpower, since I can actually do it. (Makes one question my definition of "superpower"). Anyway, the use of never losing weight or gaining muscle (assuming the person was at the average weight for their build to begin with) would be to help prevent starvation by never losing your fat stores. Of course, you could say that your body just doesn't access your fat stores to burn them, but that would be making a superpower level. The ability to flip a paintings direction could have two different meanings (as you didn't specify). Either the actual painting itself can be spun on the wall in which it hangs, or the painted picture can be changed to appear in a different direction (such as making the Mona Lisa become mirrored looking). In the former way, it could be used for causing a distraction in a major art gallery as you spin inexpensive pictures from a distance, forcing security to rush to the scene, allowing you the chance to make off with the more expensive paintings. The latter could be used to make very expensive paintings appear to be fakes, which you would then report the the curator and offer to buy the fake to take it off their hands. You could preview a camera filter to see which would be the best one to use (if at all) for a particular picture. You can also have an easier time playing the "Where's Waldo?" game by making the picture black and white and not getting distracted by all the red and white. Having a color filter over the sunlight you're exposed too can help reduce glare, allowing easier seeing in intense light. Plus, walking around with a Sepia tone on everything would be really fun, or even black and white so that you can say for certain that you see the world in black and white. Hearing a noisy squealing drill could easily block out other annoying sounds such as a nagging wife, crying child, complaining boss, etc. This is actually possible in real life, it just doesn't sound like a squealing drill, and I'm one of the rare few who can make the sound at will. [1] The ability to cut yourself to blood on any object would have two different versions of itself. Either it's passive or active. If it's passive then the super-powered fetus wouldn't have survived conception, let alone pregnancy or birth, so should we even count that? If it's active then it would be useful for producing significant, but controlled, injuries that could be used as excuses to get out of various situations like work, school, jury duty, the immediate conversation, etc. We can let the voters decide if the former or the latter counts. ... to feel like a plant? I think that falls within the realm of human disillusionment and is possible. How would it feel to feel like a plant? Strange. Making a pen burst in your pocket is borderline level because it requires a specific "in your pocket", otherwise your powers wouldn't apply. How much would your pants have to be on before they're considered "in your pocket" worthy? Wouldn't any pants you own have pockets owned by you? I say the use of this would be to make specific colored pens burst into pockets of all your clothes at least once a day, to keep the coat fresh, which will help identify someone who happens to steal your coat and sticks their hand in the pocket. Or even better, if you were to put all your pocket stuff into protective cases, you could fill your pockets with pens and explode them enough to create an ink barrier in all your pockets. Any pickpocket would find their hands soaked in ink and easily identified. Having sad face stamps as fingers is another strange one. Did the stamps replace the actual fingers? or the finger tips? Or do the fingers produce sad face stamps on whatever they touch? In any case, making sad face stamps (along with an appropriate amount of permanent ink) would be perfect for literally marking your territory as you stamp your stuff. You could also use them as your calling card, stamping your killed victim's forehead, and marking you as the Sad Face Killer. Copying any super power in a world with no super powers would result in the copier not having a super power, and is thus possible to use for anyone. Go ahead, copy my super powers! DO IT!!!! [1]: http://en.wikipedia.org... That's the tube you can open at will. I'm not sure if you can do it through practice, but when you open it, it makes a loud rumbling sound often described as thunder in the head. I can do it for about 10-20 seconds and it blocks out annoying sounds and let's me focus.