See more on using Photoshop + digipak design in this post + this vodcast.You needn't be a Photoshop genius to produce some incredible FX in Photoshop - there are 100s of ace designers out there who have shared their knowledge online, producing effective guides. Have a browse and pick out one or more that can help raise your ideas to a higher level, and just follow the step by step guides!
2015 IGS A2 student Amber got inspired by a tutorial that looked at an effect that fitted neatly with Lady Gaga's complex relationship with the press (post link):
Here Amber goes through the techniques she used:
Her drafting was made very clear too (post link):
BELOW: sample results from a simple 'youtube photoshop tutorials' search - you could of course be much more specific!
From Beauchamp College:
Understanding layers in PS