Imitation is the greatest from of flattery? But not when it's almost stealing someone else's idea.
Way back I had an idea for an cheapish souvenir for tourists to Liverpool; our lovely purple bins with a slogan [trademarked] in miniature. We sold them through various outlets in town and they are a great success, and were until one of our 'partners' decided to take the slogan 'I've wheelie-bin to Liverpool" and change it to "I've bin to Liverpool". All is fair in love and business but wheelie?