I'm sure that 'pastilla' refers to the block of colour under the logo but I'm not 100& of the correct word in English.

I had decided to try 'colour block' and that's when I discovered the previous question here.

http://www.proz.com/kudoz/spanish_to_english/marketing_marke...

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El logotipo no se aplicará en escala de grises. Para imágenes en blanco y negro, el logotipo ira con una pastilla en negro 100% y el logo en blanco
100% y viceversa.

http://bkc.upc.ub.edu/img/logos/manual_imatge _corporativa_B...

Para crear la papeleria ( papel de carta y tarjeta) se a optado por utilizar una parte de las que forman el imagotipo en forma de pastilla del color corporativo para resaltar la marca en blanco.

http://www.thebrainstormweb.com/proyectos/98_Diseno_Munna_Ho...

I’ve always presented palettes in two different ways depending on the amount of colours. In a broad palette, with many colours, I display these left to right with dominance and usage being denoted by the size of the square, or block, of colour. For smaller palettes and combinations, I use the rectangle containing a line and a square. I was taught this simple device in university but it is similar to many other examples I’ve seen. You can use circles, blobs, lines, squares. It’s up to you. The important thing is to indicate the relative weight of colour.

http://www.markboulton.co.uk/journal/five-simple-steps-to-de...