Be careful what you upload is a good philosophy when you are using any free homepage maker or blogging tool. The Raw Feed and Search Engine Journal are reporting that photos remain on Google's Blogger service even after they have been deleted. TechHash conducted a Blogger Photos Experiment to show how the photos remain on Blogger. TechHash also says you can search Blogger photos on Google Image search by using this link which shows photos that are found on the photos1.blogger.com domain. You also add any keyword(s) you want to narrow the search. Google's database contains 686,000 Blogger photos as of this writing.
More bloggers are covering this here, here and here.