How to use

In you current project or working blend file append or link the Cycles Rounded Tiles node group by

1. Going to File > Append > or File > Link
2. Browse to locate the unpacked file Cycles_ProceduralRoundedTilesR##.##.blend
3. Click on the file and navigate to the NodeTree datatype
4. Choose the Cycles Rounded Tiles 2D or the Cycles Rounded Tiles 3D node group.
5. Use it in any of your own node material by adding a new node group
6. Press Shift + A to open the menu to add a new node
7. Under Groups pick either Cycles Rounded Tiles 2D or Cycles Rounded Tiles 3D

A node with the following appearance should be added

Now use it as any regular Cycles texture node.

Be sure to provide it with adequate texture coordinates with a Texture Coordinate node. Object or Generated should do fine for most situations and are quick and simple to use. For additional refinement you may use UV mapping for better control.

You can then use the node freely either directly to control color of a shader or as a mask. Like with all Cycles textures you can use it to mask both colors, textures or even between shaders.