The Confetti System has been around for a few years now but they still are producing inspiring installations. I loved these Christmas ornaments they made from last year. They are so modern and fun. See their blog for their latest work and loads of inspiration.
more about: party decorations
I get so much inspiration for parties from over the top art installations. I especially loved this one from Japan seen on Hello Sandwich. It was made out of giant Japanese washi tape. Really really beautiful. It would be so fun to to tape the walls of a room and create an installation for a birthday party.