All the designs in this recent post from Craft Gossip are stitched on cloth, not on needlepoint canvas. But there is no reason not to adapt them for use on canvas with needlepoint threads.
I’m really fond of the French Knot initial. You could do this so easily yourself, using an enlarged and traced letter and scrap threads. Then add a lightly stitched background, such as Blackwork or pattern darning.
But so many of the other ones are just too cute.
Visit Craft Gossip to see them and get links to the tutorials.