Renting friendly options?

I'd like to make my flat more colorful but I'm renting and I don't want to ruin furniture and walls.

I used command strips for prints and it seems to be working fine.

I've seen on Instagram kind of stickers for furniture and walls. You out then on and they look like tiles or similar. But I'm worried they would ruin them or not look great. I don't really trust IG when it's about "hacks".

Any suggestions about this or any other ideas?

Thanks!