Most of the colours can be also mixed with lipstick or lip-gloss, used as blushers, eye brow definers and eyeliners. They come as loose powders highly pigmented. However there are a few exception but don't worry as on the website you will find enough information about this, also on each individual product there is info on the label.
I am a big fan of their colours and I own half their eye shades.

Use:

The best in using them is with a special eye brush rather then a sponge applicator. I personally prefer the Body Shop Nature Minerals eye shadow brush.

You can mix the colour with a drop of water until it turns into a paste and apply it around the eyes with a wet eyeliner brush. This way you will get a really intense colour as eyeliner.

Because this colours come as powder pigments is very wise to keep a tissue under the eyes while applying them as the pigment tends to fall under. However with a bit of experience on the long run I manage to avoid this completely, is just a matter in using the right amount of product and gently applying it.

The colours:

There are neutral shades like greys, whites, and black, browns, pink, violets, green and blue in a total of 31 colours. They vary from matte, shimmer to sparkly. It cost £5 a jar with aporx. 2.5g of power There is a few useful details I found:

-between Sticky Toffee and Brown Sugar is very little difference while Bronze Sparkle is about 3 times more pigmented, and when they say bronze they mean bronze and that is exactly haw your eye are going to be, that intense!
-Smokey Brown, Chock Fudge and Ripe Plum might appear the same in a certain light but Choc fudge is a bit on the dark blue/purple side more while Ripe Plum is more brownish. Sparkly shimmer shades.
-Mudpie is slightly darker then Soft Brown, both being matte.
-the black is called Witchypoo, funny name but sure is black. You will get the ultimate/ perfect effect of Goth or Arabic Kohl Rimmed eyes with this if you use it as a wet eyeliner. Use a smudge brush if you want it less intense.
-from the reds Cherry Pie is more of a purplish red then Strawberry Tarte, both are shimmery. Strawberry Tarte is kind of similar with the Real Rouge blusher.
-Terracotta Eye Colour is a reddish brown while the Cocoa Berry Blusher is more on the brownish side.

Benefits:

Well I never got irritate or sore eyes using this products. The ingredients are minimum and far better compared with the high street brands. Because they are powders they last for ages. The quality is second to none.

****Extra Tip: -because the lids are white they will get stained pretty fast. I advice you use a damp cotton disk with a few drops of cooking oil to wipe the residues gently and efficient.