This is a "seamless" texture:

Seamless images are great, until you scale them up 5 times and you can see the repeating pattern.
All seamless textures have this flaw. 

Introducing...

Anti-tile is a one-click addon for instantly removing tiling patterns from any image!

Features:

• Triple layer procedural blending
• Individual layer control
  
• Per object randomisation
• 1 click deployment and removal
• Simple controls
• PBR workflow
• Debug Mode
  
• Anti-Seam Support

Before vs After

(UV scale = 3)

Anti-tile uses per-object randomisation along with advanced triple layer blending to give you perfect results every-time. 

Individual Layer Scaling:

Individual Layer Offset:

Same object, same results:

Worried about normal maps not lining up with diffuse maps? Anti-tile, provides a same object, same mapping policy. Same random + same shift = same mapping.

Same material, different results:

Anti-tile automatically applies randomized mapping for each object, even with the same material.

Simple deployment and removal

No complicated dependencies or generated files. Just 1 click to apply or remove.

PBR workflow

Add anti-tile to multiple images and maintain mapping across all of them in 1 click, PBR anti-tiling has never been easier.

Simple Controls

• Shift: Displace the procedural blending until it looks best.
• Noise Scale 1: Control the size of first blend layer
• Noise Scale 2: Control the size of second blend layer
• Image Scales: Control the size of each image layer
• Offset 1: Control the offset of layer 1
• Offset 2: Control the offset of layer 2
  

What you get:

• Anti-tile Addon
• User Manual
• Free lifetime updates
• Good karma for supporting the Blender Foundation :)

Update Log:

v1.7:

• New Multi-layer offsets for tiled textures
  
  
• New custom defaults in the preferences window
  
• Support for node frames
• Updated user manual
  

v1.6:

• Video Texture now supported
• Applying Anti-Tile while inside node group now supported

v1.53:

• Box Mapping now Supported
• Fixes for Color space incompatibilities with Blender 2.79

v1.52:

• Introduced Support for using the Anti-Seam node group instead of an image.

v1.51:

• Fixed issues with deploying on multiple textures at the same time
• Restored uniform parameters control

v1.5:

• A big update to the addon code structure and control.
• Removed random field
• Added Image scales field to control individual layers
• Added Dual Noise scale control

v1.42:

• A small fix that was causing issues with 2.81

v1.41:

• Version Numbers aligned
• Blend property from box mapping is maintained.

Eevee v1.4:

• Bug fix that was stopping Anti-Tile from functioning inside 2.80 due to API change.
• Better packaging
• Documentation update

v1.5 / Eevee v1.3:

• Anti-tile can now be applied inside node groups regardless of depth (node group inside nodegroup).
• Bug causing console errors when deleting object now fixed
• Better node group removal using native garbage collection

v1.4 / Eevee v1.2:

• Major bug fix, duplicated anti-tile materials can now be removed without unlinking node group from other materials.
• Updated description, moved panel to correct tab in 2.8
• Minor bug fixes
• Super Texture support!

v1.3 / Eevee v1.1:

Anti-tile now will connect texture coordinates automatically when applying anti-tile to a texture. Previously many people did not initially connect texture coordinates which caused textures to not display after Anti-tile was applied. Anti-tile now takes care of everything behind the scenes :)

Blender 2.8 Eevee Full Support:

Get Fantastic looking textures in seconds with the new real-time render engine in Blender 2.8

v1.2: 
- Polling bug fix
- Neater node layout
- Texture blending debug output: Determine exactly how triple layer texture blending works on your object! No more guessing!

- Uniform texture mapping: Set the same mapping for multiple images on the same material, update only 1 field to set all of them!

v1.1: Added multiple image selection support. Simply select 1 or more images and convert them all at once. Same applies for removing anti-tiling!