You're asking me for gift advice? You do realise you're taking a risk by not asking Ginny, right?
But here goes nothing. Seeing how Teddy and Victoire has just moved in together, perhaps something for the flat? Or possibly something regarding his new job at the Werewolf clinic? Whatever you give him, just make it personal and he'll appreciate it.
As for Ginny, she just started teaching Charms a while back, so anything regarding that would probably be appreciated.
I'm so not answering about myself. Ask someone else for that info.