I recently made some Mulled Wine (Click here for instructable) and didn't want to waste the pieces of orange and lemon I had put into it because they smelt amazing with all th e mulled wine spices and the citrus.
What I thought I could do would be to dry them and use them as Christmas decorations/to scent the air.
Get however many oranges/lemons you want to use
(mine was one of each because that's what I put in that batch of mulled wine)
Slice into 1cm thick slices (about half an inch) or slightly thinner if you're good with a knife, I'm not.
These are not the fruits I used, just an illustration. I used heavily stained red ones.