I'll say that it's hard for me to find fanart where Touhou is being parodied/referenced (note that I'm really unaware of most of the newer anime/manga/comics/movies/etc.), and it's even harder for me to find games (or gameplay characteristics) that are influenced or are homaging Touhou, but anyways.. Yuki and Mai in Samidare:
http://www.youtube.com/watch?v=2hps4X9_f4k (RoHL would count too, since it uses a similar playstyle, as a source of inspiration, while not having the Touhou universe in its plot..)
Anyways, what's important, imho, is that the Touhou universe maintains its own identity (this means, not be purely or mainly influenced by external.. memes/characters/parodies/etc. As long as Touhou is properly regarded as being, for example, a series of games/stories that can generate doujin musics, fanarts, fanfics, fangames, etc., rather than being just the series that served as support for Marisa Stole the Precious Thing/Mc Roll/etc.)