I absolutely love it! Especially the wrap-shirt, I love those as actual baby clothes, so seeing one in Adult Baby size is darling. And that blanket, oh my gosh it looks so cuddly! I like the toddler leggins too, maybe I could try something like that some time...hmm...
So, brainstorming is activated.
For a sweater, my brain is conjuring up several images right now. First, raglan sleeves: They're very easy to make, and look really cute and toddlerish if you use two colourful contrasting fabrics (maybe you're even lucky and find the same pattern, but in two colours?). Second, DINOSAURS! I don't know if you wanted to do a hood, but consider this: A dino hoodie with spikes all along the back! Or without a hood: maybe add a breast pocket that some little critter is peeking out of?
You've been sticking to more toddlerish stuff, but do you plan on making a onesie too one day? I think onesies, especially long sleeve ones, look super adorbs with the kind of neckline you did on that white patterned shirt. (Also: good idea to put a button where the front and back meet, mine always shift while I'm wearing them, maybe I should add snaps too).
For dress ideas: I personally love babydoll dresses, with a short bodice and a gathered skirt, maybe a bow in the center - they can be sleeveless or have long sleeves (yes I have a slight obsession with long sleeves), maybe have a peter pan collar if you're feeling confident. Or maybe instead of a dress, a bubble romper? (Or a dress and a bubble romper - the possibilities are endless.)
I hope you don't mind me rambling at you, I'm really impressed by what you've made so far and would love to see more!