How can I spice up my relationship with my boyfriend?

We've been together for less than a year, we recently moved in together & just got over a difficult time after my miscarriage. I was very moody & a bit depressed during that time. I realize I was wrong for being that way towards him. I feel really guilty. I'm trying my best to let go of the past & get back to making him happy. I miss the old times when we use to go out & have fun. I don't expect things to be the same way they were but I need to do something to change the dynamic of our relationship into something positive. I think it's time, we both deserve to be happy. BUT... My mind is totally blank.. What can I do?