I came across these guys clips a few years back.
Two brothers that were insanely good, pro rollerbladers.
They started pushing the boundaries with real outside the box stuff.
Skating where & on things that are just so abstract from skating.
Like in a junkyard, or even in the middle of the forest!!!!
Progressed to barefoot free tree climbing, which when i first saw it i thought it was like tree parkour. Now i think he is pretty into parkour too!
His other clips on youtube are worth a look.