We just came off of a Four-day Wonder, and I took two pillowcases and markers with me. I went to Guest Services and asked if this was still being done, and they told me yes. I just needed to drop it off ( I used a ziplock back, and put our stateroom number on it). They were ready to pickup after 10:30pm on the last night.
If I were you, I would go ahead and try - but be prepared if they say no.
Good luck!!