One style that started small but eventually grew asone of the mainstream is what I called the Typographic style. I'm sure you've seen this tyle of photo very often in your stream. They are photos with some text in it, often as simple as 'Good Morning' or saying 'Wish you were here', but it could also as verbose as a quote from a famous song, a famous person or a famous book.
PicLab HD is one of these apps, except that it does more than just adding text.
PicLab HD has been labeled that text adding app, when it can do so much more. Don't just limit photo editing program just to one certain type of font. PicLab gives you stickers, phrases and elements, along with editing tools, effects and filters.