I was just wondering where I could buy stuff like something floating around my avatar or something on the ground like a tombstone, if anyone understands what I mean..? xD Is there a special shop for that kind of items or do you just have to somehow figure out what to look for in the search shops bar...? o_O

There are so many items it's hard to list them all. There are several floating items, like etc. Also different tombstones etc.

You can look for backdrop (background) items in your wardrobe, view all items on subeta.

You should also look at the foreground items - some of them may be the type of things you want to look for.