Getting the grout colour you want has always been a struggle as grout manufacturers tend to have a minimal colour pallet. Another option is mixing acrylic paint with powered grout, which does open up your colour pallet but has a few drawbacks. Many books suggest using it as a colourant, but others point out the following negatives: it requires lots of paint, can produce a pale-coloured grout and may affect the integrity of the grout itself.
A third option is using powered pigments which we have in our range. Grout colourant or power pigments can be added to powdered grout. When using powdered pigment or grout colourants, add the powder to the dry white grout and mix before adding the water. Just remember that the colour will appear a few shades darker when wet. This option costs a bit more than using acrylic paint, but I'm sure you will agree the colours are stunning!