The butterfly is one of Sandi Henderson's free patterns (also made with her fabric). I hand embroidered the antenna (which looks obvious as they aren't very symmetrical).
I love the octopus. It's very mini boden looking. You should request their catalog. They have tons of inspiring ideas for this kind of stuff. As you'll soon find out - I'm not really very creative. I get all of my designs from free tutorials and images online. This octopus came from a Sew Mama Sew tutorial found here. It was tricky and too a while to sew around the edges, but I like how it turned out. I need to paint some eye on it or something.
I just bought a few more long sleeved t-shirts for my son so. . . more to come! And maybe a little tutorial on how to do it (or at least the way I do it).