While most of these are actual artistic creations you can buy (I added links under each picture, where I could find the source of each silverware art creation), I think most can become a DIY project if you are so inclined to upcycle some old silverware. The silverware clock and mirror both look to be very doable in an afternoon with the right know-how.
If you would prefer not to by these beautiful silverware pieces and would like to take on some light welding, here is a guide on welding a spoon flower I found located at the awesome Instructables site. With some innovation and modification you can soon be creating your own art using forks, spoons and knives. Oh, My!
Silverware mirror with DIY from Flamingotoes
Jewelry tree made from spoons and forks by MissieKrissie via Etsy
Spoon hooks for small treasures
Silverware lighting creations by Francois Legault
Hooks made from Creatively bent forks
Spoon lighting by Francois Legault
Silverware flowers by Salvage Gallery