Pic for pic? Madonna is trolling Grindr for some photos. The Material Girl herself will be using the app to chat with five lucky winners through a new contest.To enter, Grindr users must recreate Madonna’s “Rebel Heart” album cover featuring themself as the star, posting it to their Grindr account and using the hashtag #LivingForLove. Entrees must be in by Valentine’s Day, so start brainstorming. Considering that the “Rebel Heart” album cover features Madonna’s face tied up with a black wire, we’re thinking some entries could take a “Fifty Shades” theme. Or, entrants could put a creative spin on the “Rebel Heart” tattoo Madonna has across her neck. Whatever angle people take, we can only imagine how all out the winners will go. Oh, to be a judge for this one.