Add some sparkle to the room with mini LED lights! I used small adhesive hooks to create the heart shape with the lights, and chose a white cord instead of green. Because this is a toddler room, these lights aren't always turned on. Leave that for special evening story times, or turn them on and off with a timer attachment.
Try removing the door to your toddler's room and replacing it with a swinging gate. It's better than keep the door open all the time and far more interesting than keeping it closed... and the best part it can keep them in the room when you don't want them roaming the house.