I bought new felt-tip pens in a small shop which sells creative stuff for kids, and it really have changed my sketchbook style. This pens are not the regular ones, you can draw with them on glass or plastic. I draw with them patterns, then draw above with the regular felt-tip pens, and the color of the first layer stay unchanged. So nice! I already decorated everything I could see around: mineral water bottle, dvd remote control, disc covers and most of the pages of my sketchbook.