Your first activity will be the mind mapping, as stated above. The importance of this is to help the students see that history influences art.
Give students a list of artists and art styles or movements from the 20th century (click here for quiz). Ask them to match artist with style allow them do a WebQuest in order to find the answers. Then, have them pick two different styles, one from between 1900-1959 and the other from between 1960-1999.
For homework, have them write an essay comparing and contrasting the two different periods. This will count towards their grade in the unit.
Have the students pick one piece that resonates with them, using art books covering the various styles and movements of the 20th century. It can be a painting, photo, sculpture or architecture.
After they have had an opportunity to study their chosen work of art, have them sketch their own creation using whatever style they picked. For instance, if a student chooses an art nouveau lamp by Tiffany, they would sketch a lamp or other object using the same techniques as Tiffany.
When they are complete, ask them to list what the aspects of their particular style are, in other words, what makes their work cubist or pop art or postmodern.