Well you can add the same Flickr Photostream widget to your Blogger blog, by following these simple steps.
I. Login to your Flickr.com account
II. Goto http://www.flickr.com/badge.gne
III. Select the type of badge, whether HTML of Flash badge.
IV. Then Choose content, whether your content only or everyone's public content.
V. Select Layout for your Flickr Badge, various other styling options including color.
VI. Preview and check whether you are happy with your Flickr Badge and get code.
VIII. Save it and you are done.
Now check your beautiful Flickr Badge.