Easy...just make your own!  It's a lot of fun 
and there isn't any frustration with finding the 
right image.  The paper can be found in any art 
supply store and if you don't have the 
paint...you can buy fairly cheap paint.  

   I usually doodle some design (or find a 
screen cap...I don't have screen capture 
abilities) before starting.  I'm not too 
concerned about 100% exact match to 
original.  

have fun.
^_^