Gifts for little boys?

Okay. So. I have a neighbor, who will be 4 in July. He is so sweet!!! And since I have nothing better to do, I always take him to parks, or we take pictures together (his camera doesn't work, but he thinks it does) or I teach him new things. One time he told his mom (Her name is Kathy, and she really appreciates that I baby sit his most of the time ) that I was his best friend. I thought that was pretty cute. But anyways, I wanted to give him something for his birthday, cause he's a good kid. But I don't have any money. I have 6 dollars, and I need to buy my mother's birthday gift with that, or at least part of that gift. I doubt I will get money before his birthday, so if anything I can get him dollar store gifts, like last year. I was wondering if anybody had any homemade gift ideas for him. And do you think that his mom and grandparents (general care givers) will feel weird if I make something? They know that I generally make things, I make all the girls jewelery all the time. But I am worried they would think that was weird. I give him my old toys all the time, If I think he would like them, and they don't care. But I am worried they would think it's weird, and inpolite or something. How would you feel?? (Were all poor, by the way, we aren't like uber rich and buy everything everybody wants) So far my ideas where A) to build a toy car racer, but I haven't ever built anything ever, and I would have to make it smaller, like 2 feet or so, and that might make it not as fun B) One of those bug kits, you can get them at the dollar store, but I bet I could make one c) a few dollar store things if all else fails


But probably not something big, since we all live in small spaces and stuff, and something he will like.

Thanks you in advance for any answers, I really appreciate it. Everybody on here has awesome ideas!