I saw this on wololo.net and thought it should be posted here too.
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Fake_NP by tpu
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This program can put your homebrew into a NPdemo package.
The faked demo can be load from OFW.

How to use
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1. sign your homebrew use seboot.exe
2. put the signed homebrew into a ISO file
3. rename ISO file to np.iso
4. prepare icon file(not necessary):
ICON0.PNG ICON1.PMF PIC0.PNG PIC1.PNG SND0.AT3
5. run fake_np.exe

Notes
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1. the size of ISO must be less than 120M bytes.
2. requres OFW version 6.20 or above.
3. source code include.

Thanks
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CipherUpdate & kono for their NP Decryptor
Mathieulh, kgsws, SilverSpring, Davee and the peoples who worked on kirk research
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  fake_np.rar (Size: 114.56 KB / Downloads: 2678)