I enjoy nonogram puzzles, also known as Paint-By-Numbers CrossPix, Descarte's Enigma, FigurePic, Griddler, IllustLogic, Japanese crosswords, Logigraphe, Nonograms, Oekaki-Logic, Picross, PictureLogic, StarPic, and Picross. Using logic you fill in a blank grid to create a picture.
Ali Corbin created a nice Java applet to play the game and created a large set of puzzles based on images from Anthony's Icon Library. I'm a fan of Ali's applet and puzzle collection. Sadly Ali's pages hosting them were taken down. Ali was kind enough to send me a copy, and gave me permission to rehost them. They are linked below: