What your kind of handmade things you can do in the first
place?
can you stitch things? get some fabric, make him a cousion, a bean
bag, a pillow case or something like that.
can you carve wood? get a plain wooden photo frame, carve something
special to you two on it, comes with the best photo you two
taken.
Good at electronics(wire wraping/soldering)? Go simlim tower(it's
tower, not square) and buy some kits that can made some fun
electronics stuff.
Cook very well? simple, just cook him his favourite dish.
you know those color filling thing that kids play?those squeeze
some gel like thing on the plate, and then dry it and become
permanent. I dont know what is it called. You can buy those and
make something, put in on his room's mirror or window.
fold a thousand paper crane to him in a nice bottle. Old fashioned
but it shows real sincerity cos it's takes very long to fold a
thousand of those.