I've got a young boy who just loves doing google searches (particularly regarding anything Mario related) and then looking at Google Images because he likes to try and draw some of the pictures he finds.

I'm concerned with some of the images that appear (even with strict set on google).  Seemingly innocent searches such as "Mario Party" or "Peach" can return some crude pictures.

Anyone recommend some protection software or have any advice?

I'm not sure I want to block Google altogether, although maybe I should.