This is what I imagined the Hufflepuff common room might look like (have you noticed that the Hufflepuff common room is the only one not visited in ALL of the seven books?) eeenjoy :)

The sky above the Great Hall was a deep, dark blue and was littered with stars. There was much noise as everyone in the hall got to their feet and started towards the exit.
'Hufflepuff first years to me, please!" called a tall boy with blonde hair, 'Hufflepuff first years to me!'
A group of timid-looking first years emerged from all around the Hufflepuff table and gathered around the Prefect.
'Is that everyone?' he asked, looking around at them all. 'Alright, follow me.' And with that he turned and led them out of the Great Hall and into the Entrance Hall. The first years looked expectantly at the grand marble staircase that stood at the other end of the hall, but the Prefect did not lead them towards it, but straight across the hall and through a stone arch that lead into a long passage way lit by dozens of torches that sat in brackets all along the walls. They passed many doors and portraits that sang greetings to them as they passed, and some of the first years even thought that they heard voices coming from a painting of a fruit bowl. They turned a corner and walked down a stone stair case that was met by another torch-lit passage way. Eventually they reached a large oak door with a silver door knocker that had a beautiful silver badger curled artfully around it. The prefect reached out and knocked twice on the door. There was an outcry of gasps from the first years as the silver badger sprang to life and tilted its head towards them. It blinked slowly, then opened its mouth and asked; 'Password?'
'Polly waffle,' said the Prefect. The badger smiled and the door swung open. Their eyes were met by a large square room. There were no windows in this room, but about a dozen candles floated in bubbles around the ceiling. The walls were crammed with bookshelves, and a fire was crackling merrily at the other side of the room surrounded by arm chairs and couches that were being occupied by chatting students. Away from the comfy arm chairs stood a few small, round tables that each had a candle burning in its centre. On opposite sides of the room stood two doors, one leading to the boys' dormitories, and the other to the girls'.