I don't want you to get caught by your teacher for plagiarizing so I'm not going to do this entire assignment for you, however, I will provide some ideas! (warning you from personal experience)
A room you can use as an example is your living room. This is because eco-friendly furniture or household products basically talks about what the furniture is made of.
which leads to:
1. Table - eco-friendly materials include bamboo, glass, recycled wood, etc. so just search "bamboo tables" as your example. Then simply write why it is eco-friendly.
2. Sofa - A sofa made out of wool or linen would be considered eco-friendly because wool is from sheep, and the way their wool grows is a natural cycle.
3. Decor - you can search up decor pieces made out of reclaimed clay or once again, bamboo or something like that and use this as your third example.
I've been in your position and I know school isn't easy but this assignment sort of seems fun haha good luck :)