Yup, superhero outfits are fun. 😛 B)
They can be serious, gloomy or goofy but that’s why they are fun 😉
By the way, maybe you want to anticipate that at least some sets will need a Symbol, so maybe leave some room someplace for a letter, a greek letter, a number, a symbol, and/or something like that ?
Maybe not for all sets but for the blankest ones (like http://epicgenerator.net/media/kunena/attachments/212/7_2015-03-18.jpg I’d believe your other examples would require like a much smaller more discrete symbol, if at all, for instance 🙂 ), that would be nice 🙂