ETA: Thanks! With your help, I've decided to not go for the tshirts!
I know there are varying opinions out there on non-edible favors. I don't trust myself to feed that many people(125ish)...I was thinking of seed bombs or maybe succulents, but I had the random thought of doing t-shirts. Is that totally crazy? I figure I'd wear it if I went to a wedding and they were giving them out...I can get our wedding colors at a pretty great deal..