hmm.. for the yoda background, use the same gradient effect as you did this time, except do it in black and white. Don't hit find edges yet tho. Ok, after you do the gradient thing, copy it 3 times, then colorize the bottom one red, the 2nd one yellow, 3rd one blue, and the 4th one purple. After that, set the top 2 to color dodge, and the bottom two to overlay, then merge all the layers, and color it green. It makes a cool effect if used properly.. you can hit find edges after that if you want too.