Best Place to Find Alpha maps for Achitecture

Method14253

Hi, I am following a tutorial that uses alpha maps in 3DCoat to quickly stamp architectural elements onto an object. I am wondering what the best place to find Height/displacement/alpha maps for architecture would be. I do not usually look for this kind of thing so material artist or 3D artists advice would be helpful, Thanks. Example of what I am trying to get below:

toxicsludge77

I've not really searched for this kind of stuff, but check out https://www.textures.com/  or what I've done in the past is find some nice decorative fonts that you can easily turn into an alpha. 

Method14253

That was my guess was textures.com wasn't sure if it was good or not or what is used professionally for this kind of thing