The San Gabriel Mountains Discussion Forum has done
this and IMO it's a really cool idea.
Interesting... By the way, what is the meaning of "Eispiraten"?
I'm sure a sticker with Mt. Whitney's silhouette would be quickly recognizable.
Here are a couple that turned up in a search:
Cafe Press:
US 395 Store:
I still like the idea of the green surveyor tape. Stickers can be placed various places, but a little tape hanging off a pole or pack strap would be more recognizable on a hiker. I'm waiting for wagga's contact to reply.