Mousse ring for making mousse cake and loaf pan for making loaf bread or loaf cake. You can also use the slice tray for making brownie or mini swiss roll.
It's good to have all kinds of baking utensils as when the recipes call for it, you had the equipment ready for use. But for my case, I seems to be collecting them more than using it... :)
I had a wide collection of cookie cutter as I love their shapes and patterns. Usually other than making cookies, I also use the smaller cutter to cut out patterns from carrot, yam, potato or etc. This will help you to make your dish more presentable like restaurant style....
All these disposable baking cups and trays are a great way to serve your baking as a gift. In another way, it will save your time and effort on greasing or washing the tins. You can get different sizes for making cakes or muffins, sometime it can also be used as a base for baking bread like those sold in the bakery shops.