Here's what I did. I did this in Feb so I don't have pictures of the process but it's pretty easy. I cut letters out of pieces of felt (craft store: $.25 each) spelling out "we <3 Daddy" and glued them onto plain t-shirts that were about to be too small for my boys. Then, I took pictures of them together and framed it. So cute!
Easiest thing ever. And it looks so cute on his desk at work. Love.