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It would be easier to use Inkscape(dot)org which is free and Open Source. It's a vector image editor, so it's particularly suited to this kind of work, unlike GIMP which is a raster image editor.

In Inkscape, simply switch on the grid and enable snap to grid, then draw triangles using the Pen Tool, and select the fill colours you want.

Here's a very quick demonstration of what's possible.

Even better, you can use SVG's created in Inkscape directly in your web page - which means the image doesn't even need to be rasterised.

It would be easier to use Inkscape(dot)org which is free and Open Source. It's a vector image editor, so it's particularly suited to this kind of work, unlike GIMP which is a raster image editor.

In Inkscape, simply switch on the grid and enable snap to grid, then draw triangles using the Pen Tool, and select the fill colours you want.

Here's a very quick demonstration of what's possible.

Even better, you can use SVG's created in Inkscape directly in your web page - which means the image doesn't even need to be rasterized.

It would be easier to use Inkscape(dot)org which is free and Open Source. It's a vector image editor, so it's particularly suited to this kind of work, unlike GIMP which is a raster image editor.

In Inkscape, simply switch on the grid and enable snap to grid, then draw triangles using the Pen Tool, and select the fill colours you want.

Here's a very quick demonstration of what's possible.

It would be easier to use Inkscape(dot)org which is free and Open Source. It's a vector image editor, so it's particularly suited to this kind of work, unlike GIMP which is a raster image editor.

In Inkscape, simply switch on the grid and enable snap to grid, then draw triangles using the Pen Tool, and select the fill colours you want.

Here's a very quick demonstration of what's possible.

Even better, you can use SVG's created in Inkscape directly in your web page - which means the image doesn't even need to be rasterised.

It would be easier to use Inkscape(dot)org which is free and Open Source. It's a vector image editor, so it's particularly suited to this kind of work, unlike GIMP which is a raster image editor.

In Inkscape, simply switch on the grid and enable snap to grid, then draw triangles using the Pen Tool, and fill them with the colours you want.

Here's a very quick demonstration of what's possible.

It would be easier to use Inkscape(dot)org which is free and Open Source. It's a vector image editor, so it's particularly suited to this kind of work, unlike GIMP which is a raster image editor.

In Inkscape, simply switch on the grid and enable snap to grid, then draw triangles using the Pen Tool, and select the fill colours you want.

Here's a very quick demonstration of what's possible.