If you're looking for simple ways to give a room in your home some appeal, what about painting some shapes onto the walls? Now, you could accomplish this by painting just a few geometrical shapes all over the walls, randomly placing squares and circles, but don't limit yourself to that.
For example, think about your laundry room. What if you'd paint the walls a sky blue color and then paint a clothesline on one wall? And don't quit there, go ahead and paint some "cartoony" clothes on that line. You could use bright colors in the clothes you "hang" on that line and those bright colors would infuse your room with a sense of fun and interest without overpowering it.
If you're looking for a twist on this idea, go ahead and hang a "real" clothesline on your wall and fill it with "clothes" that you cut out of extra wallpaper that you may have lying around.
This is a simple project and a fun way to use up excess wallpaper. Just glue two sheets of wallpaper together (same pattern on the front and back or different patterns--it doesn't matter). Glue the two sheets together and, when they're dry, cut shirt, dress and pants shapes out. Then, using real clothes pins, hang these items on your line.
Whether you paint the clothes shapes onto the wall or cut them out of wallpaper, this is a great way to infuse your room with color and interest (and a sense of whimsical fun) without having to completely overhaul the entire space.