Ideas for the "I'm sorry" gift..

My SO have been fighting a lot recently over petty stuff.. I believe I am going through some sort of funk or depression and I think I am starting to bring him down. He isn't as positive lately and we seem to be annoyed with eachother a lot this past week. I am ready to nip this in the bud and I'm going to try my hardest to express this and pull out my good mood. When I get home from work I'd like to present him with a gift... you know like when he gives you flowers... but I want to give him something. Any ideas? BTW we are in a very strick diet so it can't be food/drink related. Any advice is helpful. Thanks!