Gimp Tutorials
Fluid Grid using text-align: justify
Here is a list of Gimp tutorials
How to make tileable worn brick texture
How to make tileable cobblestone texture
How to make tileable wood texture
How to make tileable oxidized copper texture
How to make tileable leather texture
Resize the grid to see how the elements reflow based on the new column-widths defined in the media queries.
There is no need to ever define horizontal margins/floats/or clear-fixes.
*These elements are visible only for demonstration purposes and should be hidden in production by removing the borders.
More info here: here