Beds

One of the best tips I know for keeping your bedroom clean is to make your bed. If your bed is a mess, the room looks like a mess. But if the bed is made, the room looks clean. To help keep the bed made it helps to have the top sheet and covers tucked in well. If they are tucked in well then making the bed is just pulling up the sheet and covers, which takes less than 30 seconds.
A well placed teddy bear or decorative pillow next to the normal size pillow or pillows adds a lot too.