Over here currently have a lemon tree, lime tree and a mandarin tree all grafted, giving lots of delicious fruit.
I learnt a lot from miniature fruit orchids and grafting from YouTube vids, though I won't post what it is, as I don't want to come across as a spammer.
Cherry tomatoes (Mixed from red, yellow, orange, green.), green beans, eggplant (Black Beauty) and plenty of swiss chard (Every variety one can purchase.)