snitch symbol? & sirius' bike

[rubytuesday_666]

There was a fic where Harry uses a simple drawing of a snitch with a lightning bolt thru it to represent himself. i think he draws this on ron's window at the burrow to say 'harry was here'. I am foggy on the rest of the details other than sirius' bike was involved...

I am also looking for fics where Harrys use of sirius' motorcycle is a major part of the story.

thanks