Complimenting my boyfriend

I feel like i don't compliment and do nice things for my boyfriend enough. I did at the beginning but we've been dating for a year and a half, and I just feel like I've gotten lazy, neither of us do a lot for eachother anymore but I do so much less for him than he does for me. I feel like he just does so much for me. How are ways that you guys do things for your SO to make the happy, simple things, not sex or spending a lot of money. I want to try to be a better girlfriend because he deserves it for all that he puts up with with me and for everything he does for me.