why would you need anything bigger than that? the biggest marker i rock is a mini wide, and that shit is big enough. now a VHS tape, that shit is huge.
if you want your shit HUGE, either
a) make some posters and wheatpaste that shit around town. they're huge and they get noticed.

throw ups. also large, also get noticed.
c) krylon and a fatty. flair that shit up.
d) break out the rollers.
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I Kill People