When it comes to eye shadow, I have such a big collection but use hardly any of it. I prefer using palettes, especially my Urban Decay Naked Palette, and so everything else rarely gets a look in. As I travel to Aiden's reguarly, it's not practical to take my Naked Palette with me as it's quite big and the less I have to carry, the better.
The Body Shop Shimmer Cube Palettes are perfect. They contain four colours, which generally compliment each other and can be used together on their own. I have two; Shade 06 and 07. Shade 06 contains lovely neutral browns and is perfect for a natural smokey eye. Shade 07 (pictured) isn't online, but contains lovely colours.
What I love about these is that they are very pigmented, and they are perfect to travel with. They cost £16 which works out as £4 a shadow, which is pretty good. Also, each shadow is 4g! Compare that to a MAC eye shadow which has 1.6g.
There are a range of palettes available in store and online.