Here is my code for an ArrayList of PGraphics pages. You can create multiple pages and move between them with the arrow keys. Now I need to work on inserting new pages between existing pages and delete pages. I would like to make a Page class, but I'll figure that out later. Any input is welcome.

1. int currentPage = 1;
2. ArrayList<PGraphics> pageCollection = new ArrayList<PGraphics>();
3. void setup(){
4.       size(400,400);
5.       background(255);
6.       pageCollection.add(createGraphics(300,300));
7.       pageCollection.get(0).beginDraw();
8.       pageCollection.get(0).background(200);
9.       pageCollection.get(0).endDraw();
10. }
11. void draw(){
12.       frame.setTitle("Page " + currentPage + " of " + pageCollection.size());
13.       background(255);
14.       image(pageCollection.get(currentPage-1),50,50);
15. }
16. void mouseDragged() {
17.       makeMark();
18. }
19. void makeMark() {
20.       pageCollection.get(currentPage-1).beginDraw();
21.       pageCollection.get(currentPage-1).smooth();
22.       pageCollection.get(currentPage-1).stroke(0);
23.       pageCollection.get(currentPage-1).line(pmouseX-50,pmouseY-50,mouseX-50,mouseY-50);
24.       pageCollection.get(currentPage-1).endDraw();
25. }
26. void keyPressed() {
27.       switch (keyCode) {
28.             case LEFT: //scroll left through pages
29.                   println("###### Go Back One Page ######");
30.                   if (currentPage == 1){
31.                         currentPage = 1;
32.                   }else {
33.                         currentPage -=1;
34.                   }                 
35.                   break;
36.             case RIGHT: //scroll right through pages
37.                   println("###### Go Forward One Page ######");
38.                         if (currentPage == pageCollection.size()){
39.                               newPage();
40.                         }else {
41.                         currentPage +=1;
42.                         }                 
43.                         break;
44.             case UP: // insert new page at end
45.                   println("###### Add New Page to End ######");
46.                   newPage();
47.                   break;
48.             case 32: // display toggle of a ghost of prev page
49.                   println("###### Spacebar ######");
50.                   break;
51.             case DOWN: // delete current page
52.                   println("###### Down Arrow ######");
53.                   break;
54.             default:
55.                   println("###### keyCode error ######");
56.       }
57. }
58. void newPage() {
59.       pageCollection.add(createGraphics(300,300));
60.       pageCollection.get(currentPage).beginDraw();
61.       pageCollection.get(currentPage).background(200);
62.       pageCollection.get(currentPage).smooth(); 
63.       pageCollection.get(currentPage).stroke(0); 
64.       pageCollection.get(currentPage).endDraw();
65.       currentPage +=1;
66. }