Is there a site where i can dowload free textures?

Yes, but this is not Unity specific.

Google will help you.

http://cgtextures.com/

http://my-textures.com/

High-resolution, No Registration, No Limits.

Free Textures from Texturegen - a large collection of high resolution textures to download and use for both commercial and personal projects.

I like http://www.vray-materials.de/ They’re materials for vray but the image elements like difuse, normal, etc are there so you can use them in Unity.

www.episcura.com has a lot of seamless textures, HDRI as well as some stock photography, all royalty free.

Here you have few good sites with free textures that you can use in you projects:

http://emske.com/category/graphics/textures/

http://dezignus.com/category/textures/

369 Textures to Download (JPG, PSD, PAT, ABR) - WeGraphics you have a good webpage with free textures: Textures

Hi!check out www.texturise.club
free seamless textures with maps!

I use this some times link text

Textures4Photoshop has lots of free textures:

Textures.com lets you download I think 15 per day at 1024x1024. If you have a paid account you can download more at higher resolutions.

here you can get nice and latest texture collection for FREE

Textures4Photoshop has lots of free textures

hi, check this also : vray materials
more than 5k different category vray materials for free download without any registered. cheer!

TextureX is a good site for Free Textures