Everyone likes props for their games, right? Especially if they're easy to construct. One tool that I've found very helpful is the font listed above and downloadable here: Cthulhu Runes. The text above actually reads Iä! Iä! Hobo fhtagn! Hobo being a common online nickname of mine. Although the font doesn't include capital letters or punctuation marks, so it literally just reads ia ia hobo fhtagn.
Naturally anything written in this font won't be readable, but it's still a nice decorative element, and it has just the right alien and primeval feel that any game looking to incorporate that "Mythos tone" could make some use out of.