New sex positions

I want todo something that will blow my husbands mind and make it an unforgettable experience. Weve tried about everything ( missionary, doggie, anal sex, 69, and a few other positions) our sex is already amazing and we both love it! But i want todo something different, something he will be wowed by! Any suggestions as what todo? Keeping in mind as well that he has had back surgery in the past and has back pain very often. At times our sex can last for hours due to his medication keeping him from ejaculating. Just looking for something different, something fairly easy, and something to spice things up a bit!