Here's a great idea - Clocks & Sundials from recycled vending machine coffee cups and they look fantastic as well! 

Easy to read. Set to UK latitude. Comes with full instructions. 245x190mm in size. Horizontal mounting.

The entire range of clocks from the ashortwalk recycled range are hand crafted in the UK and made from vending machine coffee cups direct from the national Save-A-Cup scheme. http://www.save-a-cup.co.uk/

At work buy one vended cup of coffee today, drink the coffee, place the plastic cup in the recycling bin, and see if it's home time on your wall clock made from plastic cups next week. The recycling loop has been closed!

Do a little - change a lot