Looking to stretch your skills you may be interested in learning more about different types of things. Lots of designers find inspiration from album art, and there are some helpful tutorials for learning more about creating your own album covers with Photoshop.
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Linkin Park Album Cover
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Lara Croft Album Cover
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How I Designed 3 CD Jackets Just by Listening to Music
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From Dull Digital Photo to Sweet Old School Album Cover
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Electrifying Glow Album Art
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Designing a Cover Using Spectrograms
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CD Cover Design