Here is a fun little sprite entertainer, a sort of not-a-game where your finger motion launches a sprite travelling across the screen, creating interesting patterns.  The sprite comes from an example on the tutorials, i believe the transformations tutorial but not sure.  I am just learning how to write Android apps and thought I'd share this one.  I'd publish it as a free app if I knew how (can't wait for that to get automated).  Enjoy!  

2. // spriteFun
3. // by Les Hall 6-14-2013
4. 
   
5. 
   
6. int nextX, nextY, prevX, prevY;
7. int velocityX, velocityY, stepX, stepY;
8. int red, green, blue;
9. color bg, fg;
10. 
    
11. 
    
12. void setup() {
13.   bg = color(63, 31, 127);
14.   background(bg);
15.   randomSeed(0);
16.   noStroke();
17.   fg = color(255-red(bg), 255-green(bg), 255-blue(bg));
18.   fill(red(fg), green(fg), blue(fg));
19.   textAlign(CENTER, CENTER);
20.   textSize(128);
21.   text("SpriteFun", width/2, height/4);
22.   textSize(96);
23.   text("by Les Hall", width/2, height/2);
24.   textSize(64);
25.   text("Touch and drag to make sprite patterns", 0, 3*height/4, width, height/4);
26. }
27. 
    
28. 
    
29. void draw(){
30.   // draw sprite rectangle
31.   prevX = nextX;
32.   prevY = nextY;
33.   nextX = mouseX;
34.   nextY = mouseY;
35.   if (prevX == nextX) {
36.     stepX += velocityX;
37.   } else {
38.     velocityX = nextX - prevX;
39.     stepX = nextX;
40.   }
41.   if (prevY == nextY) {
42.     stepY += velocityY;
43.   } else {
44.     velocityY = nextY - prevY;
45.     stepY = nextY;
46.   }
47.   if (stepX > width) stepX = 0;
48.   if (stepX < 0) stepX = width;
49.   if (stepY > height) stepY = 0;
50.   if (stepY < 0) stepY = height;
51.   
52.     
53.   color c = getColor();
54.   sprite(stepX, stepY, c);
55. }
56. 
    
57. 
    
58. color getColor() {
59.   red = (red + 1) % 256;
60.   green = (green + 3) % 256;
61.   blue = (blue + 5) % 256;
62.   color c = color(red, green, blue);
63.   return c;
64. }
65. 
    
66. 
    
67. void sprite(int x, int y, color c) {
68.   fill(red(c), green(c), blue(c));
69.   pushMatrix();
70.   translate(x, y);
71.   rotate(radians(frameCount * 31  % 360));
72.   rect(0, 0, 80, 20);
73.   popMatrix();
74. }