Finally, after all that oldschool, here's something new!
This is a mylar (metallic) Sonic X party balloon. The balloon is shaped so that it makes a puffy outline around the "Thumbs Up" Sonic X stock art. As you can see here, it's quite well done and realistic. The background is likely a metallic lighter blue color. The 'stem' is on his right foot, which can result in the balloon not floating streight up, but at a slight angle. This balloon is BIG too! Likely to be around 38 inches high. It's printed on both sides, so you can place it anywhere to decorate. THIS is the kind of party supply you want! And if you want one for your party, you can have it by going to Ebay and doing a search for "Sonic Balloon" an ebay store has picked them up, if they aren't on auction currently.

Does the arm in the above photo look odd? It is. For some reason a fake arm has been added to the photo. Don't worry though, the balloon DOES have it's own arm. Since it's big, it should stay up for a long time. But what if it goes flat? Since it's mylar, it can be refilled at a party store, or, you can press all the helium out of it carefully once it is nearly flattened and hang it on your wall as a shiny Sonic poster. It's a party decoration that keeps on decorating!