I love the concept of Bizarro and how on Bizarro world you would have Bizarro everyone. A Bizarro Batman has appeared in comics before, but the most recent (Jeph Loeb) version made no sense. I agree he should be "the world's worst detective", but visually his design made no sense. Batman hides in the shadows and is dark. He never smiles. So Batzarro should be silly and brightly colored, unable to hide or lurk, and always having a grin on his face. Anyways, here is my Batzarro.
You can see the original sketch here
I also did a Batmite and a Mr.Freeze if you're so inclined