a gift for my father

I am 11 days away from the big day and we have gift ideas for my mother, FMIL and FFIL but I'm having a real difficult time trying to think of something to get my father. He and I have grown close during the planning process and he's not a big gift type of person (all he asks for are tshirts for the holidays or birthday). My mom is helping me keep it a surprise but I'm doing a first look with him. I was thinking about maybe a personalized handkerchief? Maybe another little small gift? I'm drawing a blank. It's getting closer to the big day and I'm finishing up my grad school classes for the summer so I KNOW I'm over thinking this. Any suggestions would be greatly appreciated if anyone could help a girl out?