Playing with combinations of pictures and words can be very effective for many reasons in class. These two sites offer simple possibilities for exploring words and grammar visually.
http://www.pimpampum.net/phrasr/ allows you to type in a sentence and the programme then assigns a picture from Flickr to each word (you can accept or change the images offered). The end result can be shared with friends via email. Fun for homework or in class, for simple sentences or a an unusual way of exploring what may be seen as more “boring” structures such as the passive or conditionals.
To use the next site you do have to register but that is quick and simple. http://www.piclits.com allows you to choose an image and write over it, a description, a story or simply word association. You can do this free style or use the Drag and Drop word options it offers. The latter are an excellent way of practicing vocabulary such as adjectives or even verb forms. Again, it has limitations but it is a visual way of exploring language.