Absolutely LOVE this thread!
Use old CDs to decorate with old wrapping paper or whatever and use them as Christmas ornaments or door hangers.
Use old CDs as coasters.
Use old wine bottles as candle holders.
Use old cereal boxes as magazine holders (remove top and cut off about one third of one side.
Use old egg cartons to sprout seedlings before transplanting outdoors.
Round candy tins (I use Altoids) are the perfect size to store Sony PSP disks (this one from my 14 year old son).
Don't want to hijack this thread so for more ideas, check out...
http://www.recycling-revolution.com/...ash-ideas.html
I guess it's a bit of a shameless plug.