Inspired by the wonderful expressions babies make, this plugin allows you to impose speech bubbles on top of images in order to add captions. 
It does not have to be a baby or anything about kids for that matter; it works wonderfuly for images with lots of expressions.
Please feel free to visit <a href="http://www.vannybean.com" rel="nofollow ugc">VannyBean</a> for any questions or more information.

Speech Bubble

Allows you to enter captions inside of speech bubbles on top of images.

Gregory Cornelius

Adjust an image’s margins and border with ease in the Visual editor.

Advanced Image Styles

Adjust an image's margins and border with ease in the Visual editor.

Speech Bubble vs Advanced Image Styles