How can i make my room fun and colorful?

Add a complementary color to the mix and pull it all together. For lime green and blue, I'd choose hot pink for a splash of color.

If you have a lime green comforter, add some hot pink throw pillows and a hot pink cuddly blanket to the bed. If you want it to be really vibrant, choose pillows that are furry or of a retro-type material.

Add a lava lamp or a cool new shade to your existing lamp.

Get some hot pink sheets and a pillow case that has pink and lime green. You can buy sheets like that are Pottery barn or Bed, Bath, and Beyond.

Add mirrors to your walls. If your wall color is dark, it will brighten the room.

If your current rug is all blue, add a hot pink shag area rug like this Vivid Pink Flokati area rug.