If you are searching for free brushes for Adobe Photoshop then this photoshop brush is correct choice for you. It contain paper, concrete, rust, bokeh and various other 35 brushes.
These brushes are work of reddit user Eyger. It was originally shared on reddit thread. 7 of the brushes are 2000×2000 the rest are max res 2500×2500. You can use these brushes to add texture and depth to graphics.
Download link (130 MB) :https://mega.co.nz/#!GMwCzSSB!bx_q50dAHSEwKtWJX-GK_U0fRNA-WNHXTjBQ_iG0SCw