I have found a page on facebook that does funky kids clothes and they can be personalised. I can't decide what I think about them yet. A couple of examples of the designs they do are here and here.
They also do accessories and things like scratch mitts, bibs, hats, gloves, scarves, pants, vests, sleepsuits, blankets, duvet & pillowcase sets, taggies, comforters, aprons, oven gloves, bags, teddies with tshirts.
I think that this particular personalised stuff looks a bit naff, but don't really like personalised stuff anyway. I assume this is yours or a friend's business - I think that you may be aiming for a different type of person to me. Things like the "Lil' bro" top is bleurgh.
Minnie - it is a well known idea that it is safer not to print your child's name on their clothing (as I said it is a theory, I don't think that there are paedos lurking around every corner). It is easier for children to be taken by people who can say "Hello Sally, your mummy asked me to take you home today" than if someone attempts it without knowing the child's name.