There is a plethora of websites which contain interactive shape games. These games act as a reinforcement and consolidation of skills. I have listed a few of these interactive games and songs below. This post id on teaching children about naming and the characteristics of 2D shapes. These games would be suitable for the junior grades.
http://www.mathcats.com/explore/polygonplayground.html Polygon playground, this site allows you to drag the shapes and create pictures, patterns, etc. It would be good to talk about tessellations, shape characteristics etc.
http://www.bbc.co.uk/cbeebies/misc/games/misc-shapestore: The shpae store by the BBC. Allows the children to drag and match the shapes to the ones in the picture.
TES iBoard have created a basic shape game where you have to create the picture using the shapes. This would be good on an interactice whiteboard and the students can move the shapes around. http://www.iboard.co.uk/iwb/Positioning-Shapes-655
Another similar game for TES iBoard http://www.iboard.co.uk/iwb/Picture-Making-with-Shapes-653
http://www.iboard.co.uk/iwb/Shape-Grabber-595 this one is a little different, it describes the shape and the students have to pull the shape from the river.
And of course You Tube songs: