I need help with finding a list, if one exists of background and foreground items as I plan on collecting them as I love all the custom ones I have seen. If anyone can please help me with this, I would truly appreciate it. I have tried doing searches but I have only found a handful of items that way. Thank you!

Subetalodge has a good list of them all. You can also use your wardrobe with "All items on Subeta" selecting foreground and background.