Matter Chatter (song for kids about solids, liquids, and gases) is a great song to help kids remember each state. The song is also interactive and encourages students to answer questions. I would pick this as my anchor text.
This is a pretty sweet idea. Paint canvas the color you want your stencil design to be then spray an adhesive to the stencil and place it on the canvas. Now spray the entire canvas. Remove stencil and you're done. With horses for bonus room