What are some good gift ideas?

Im getting a bunch of people in my school gifts, even the people that are mean to me. i love giving gifts, but i can’t think of anything good to give anyone! so i decide to make a post and ask because some people might have great ideas. :) also i’m getting gifts for people in my school that i don’t really know... and i was gonna give them a shirt that said “I ❤️ (my name)” but how am i supposed to know their shirt size?so i can’t do that. so now i dont know what else to get everyone, anyone have good ideas?