Well, it looks like now might be a good time to test drive some more of the line, as Superdrug is currently running a 3 for 2 offer on all GOSH cosmetics. I've heard good things about the eyeshadows in particular, and the Quattro Eye Shadow seems like a good place to start, for £7.49. - although maybe not in this particular colour palette - I don't think bright yellow and green would be a good idea in the hands of an eyeshadow novice like myself!
Browse the GOSH line at Superdrug.