Tips for personalising your things

From websites that greet you to necklaces bearing your name - personalistion is the name of the game these days. It's a nice idea - a bit of you in the things you own. I like to think of the second-hand buttons I sewed on my jacket have personalised it. After all, no-one else's jacket now looks like mine. Do you have tips on how to personalise your things, especially if they make life a little sweeter?