A walking clock?
In all seriousness, with my friends we've gone in together to get something classy and permanent for them to remember us by - like a really nice framed photo, pen and wooden box, wooden bedside desk and cabinet, cuff links, I got a classy globe - all of which are engraved with a personal message and all that and suited to each person's personality. They've been very good gifts. But really, not knowing what you like, have, want or need, I can't really answer your question all that well.