One example (for writing) is something like Nanami (Kamisama Hajimemashita)'s ability to change the property of something by writing words on talismans.
Another example would be an artist who can make drawings come to life (I think I've seen something like this before, but can't quite recall where). There was also that antagonist in Nurarihyon no Mago whose drawings could affect the real world.
The onmyouji tag produces some results (it's a concept similar to shikigami, but not quite the same), but I'm interested to find more!
![biggrin](emoticons/beigebiggrin.gif)
Looking forward to recommendations! Thanks for your help!
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http://www.fanfiction.net/~stelraetnae