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You could just spell out the words "No trespassing" with the welcome mats.

Heavens to betsy! What a wonderful idea!

People won't know whether they're coming or going! moohohahahah lol

It'll attract detail-oriented folk, and keep away "big picture" people.

LOL

Dude I have to make this now, probably digital art, but it's so damn absurd it becomes hilarious.

Thanks for the inspiration!

Sweet! Drop the link when you post, and I'll wander by with my $0.10 of voting POWER