If you find textures that you like or aren’t the ones that look appealing to you, i would consider attempt to create your own if you cant find the ones your looking for whether in toolbox - or texture sites:
If you’re just looking for certain textures used on actual buildings (real life) or implemented inside showcases there are there are thousands of resources available in the toolbox and useful sites you’ll need to see if they’re useable to be used.
You could always search ‘texture pack’ in the toolbox you’ll find some useful textures and see whatever suits your liking but you’ll be better off finding other textures to make your builds more immersive or whatever approach your going for. There’s a few textures sites that could possibly provide you what your looking for. If you cant find textures in the toolbox there are sites that could be used to gather a few textures from.