PS + has never given good new releases? I guess they weren't 100% fresh, but the other month PS3 got DMC & Bioshock Infinite as well as some other stuff too I think. THAT is a good freebie month. And one month it was Borderlands 2, the InFamous games, I forget everything they've offered, but they have absolutely offered big high profile games that are under a year old, for free.
What games do I propose? I don't know, I just know that right now, the PS4 offerings on + are not nearly as appealing as they are for Vita and PS3.
I would suggest offering things like PS1 classics, but those aren't even fucking playable on my high end gaming console (I can still play and download those games on my PS3 though.)