OnePlus shows some Love with these free Cover Cases
https://festwiz.blogspot.com/2016/02/oneplus-shows-some-love-with-these-free.html
OnePlus is offering its own Valentine's day specials and is now bundling a free Rosewood case with OnePlus X purchases. What you need to do is enter the "XOXO" promo code upon checkout.
Alternatively, if you're after the OnePlus 2, you can get a Black Apricot StyleSwap Cover free of charge. The promo code for this one is "LOVE".
Only these two specific styles are part of the offer, one for each smartphone. If you've chosen a different case/cover, entering the promo code will add the correct one, deduct its price, but still keep the one you originally selected, so make sure you delete it.
Additionally, if for some reason you've decided that now's the time to get both the OnePlus X and OnePlus 2, you can't claim both promo codes in the same order.
Source
Alternatively, if you're after the OnePlus 2, you can get a Black Apricot StyleSwap Cover free of charge. The promo code for this one is "LOVE".
Only these two specific styles are part of the offer, one for each smartphone. If you've chosen a different case/cover, entering the promo code will add the correct one, deduct its price, but still keep the one you originally selected, so make sure you delete it.
Additionally, if for some reason you've decided that now's the time to get both the OnePlus X and OnePlus 2, you can't claim both promo codes in the same order.
Source