The following are some GSoC proposals that have been accepted in previous years for KDE. They can help you get an idea of what KDE is looking for in proposals.

Those are just some examples though - you do not have to follow them precisely!

Newer ones are at the bottom.

• Victor Carbune: http://swarm.cs.pub.ro/~victor/kde/gsoc/kde_2010.pdf
• Prakash Mohan: KStars-2009
• Teo Mrnjavac: http://docs.google.com/View?id=dg7vjhzd_35cdhfg4gh and https://docs.google.com/View?id=dg7vjhzd_3xhk44qhb
• Tirtha Chatterjee: http://www.google-melange.com/gsoc/proposal/review/google/gsoc2011/wyuka/1
• Alexandru Tudorica: http://www.google-melange.com/gsoc/proposal/review/google/gsoc2011/tudalex/1
• Akarsh Simha: http://sites.google.com/site/akarshsimha/gsocproposal
• Shantanu Tushar: http://www.shantanutushar.com/content/my-gsoc-2010-proposal
• Benjamin Port: http://blog.ben2367.fr/2010/04/16/candidature-gsoc/
• Kaushik Saurabh: https://docs.google.com/document/d/1aVWTr-nNnicHKYM2uMTX8tSCF6cbndJ3zPczOqJF0xU/edit?usp=sharing
• Daniel Marth: http://www.google-melange.com/gsoc/proposal/review/google/gsoc2011/danielmarth/1
• Sinny Kumari: https://docs.google.com/document/pub?id=15R20-m9wyYxNAt7zwW46v_cNJzcF0LL0fUey-NeML8s
• Dmitry Kazakov: https://docs.google.com/document/d/1bn-IJfkc_x4L5WrJAqZV74EErx_8tY8IncCd9aexhhE/edit
• Srikanth Tiyyagura: https://docs.google.com/open?id=0Bxqr8JWMy5U_ZWI0M2VlZjAtMmE0ZC00NzdmLThkZjUtY2FkMGMwNzc1NDM3
• Karan Pratap Singh: http://www.google-melange.com/gsoc/proposal/review/google/gsoc2011/wizard_karan/1
• Aakriti Gupta: http://google-melange.appspot.com/gsoc/proposal/review/google/gsoc2011/aakriti_gupta/1
• Phaneendra Hegde: http://www.google-melange.com/gsoc/proposal/review/google/gsoc2011/phaneendranh/13001
• Alessandro Cosentino: https://google-melange.appspot.com/gsoc/proposal/review/google/gsoc2012/cosenal/1
• Pankaj Bhambhani: http://google-melange.appspot.com/gsoc/proposal/review/google/gsoc2012/pankajb64/1
• Yuvraj Tomar: http://www.google-melange.com/gsoc/proposal/review/google/gsoc2011/yuvrajtomar/1
• Smit Mehta: https://docs.google.com/document/d/12X5UAXt3c1w5w0JO8Pud-JsBC7g5UOPfTGkATGhAcTU/pub
• Miquel Sabaté: https://google-melange.appspot.com/gsoc/proposal/review/google/gsoc2012/mssola/1
• Martin Klapetek: http://www.google-melange.com/gsoc/proposal/review/google/gsoc2012/mck182/27003
• Yash Shah: http://www.google-melange.com/gsoc/proposal/review/google/gsoc2012/yashshah/1
• Shrikrishna Holla: http://www.google-melange.com/gsoc/proposal/review/google/gsoc2012/shrikrishna_holla/1
• Shivaraman Aiyer: http://www.google-melange.com/gsoc/proposal/review/google/gsoc2012/sraman/1
• Abhishek B S: http://google-melange.appspot.com/gsoc/proposal/review/google/gsoc2012/abhishekbs/1
• Kunal Ghosh: https://github.com/kunalghosh/GSoC_2011_ownCloud_Proposal/blob/master/ownSync.txt
• Arthur de Souza Ribeiro: https://google-melange.appspot.com/gsoc/proposal/review/google/gsoc2012/arthur_sr/13002
• Sinny Kumari: https://docs.google.com/document/d/1zukVw1bP-pZeoi9bzl5ONFDjRGjt2oLa1pd0ucExphU/pub

The published version of this doc can be accessed at http://goo.gl/EvyrX