As a user of a custom eboot myself, and for the sake of convenience, I've reposted links and preview images of the custom eboots from the old forum in a new central topic. All credit of course goes to the original authors.
Q: Are there any custom eboots for the golf games?
A: No, Patapon 2 is a freely redistributable demo.The golf games are not and cannot be redistributed, nor will they work if modified.
Q: Do the custom Eboots load hbl directly?
A: No, The only things changed are the PIC1 ICON0 images, the snd0 audio clip, and in some cases they add a splash screen that replaces the blank black screen that appears just after the white PSP logo, and some reduce the size of the DATA.psar.
Q: Can this even be done?
A: No,attempting to modify the game in such a way would corrupt it rendering it unplayable, and thus would be pointless.
Q: Do They work on fw. 6.30/6.31?
A: Yes and no, except for the size reduced ones by cobaltex and ozkar1313 which can only be used for hbl. The other eboots can work on new firmware, but only to play patapon 2 since Sony patched the patapon exploit.
Q: How do you create a custom eboot?
A: Extract the eboot with pbp unpacker found here and replace the image and sound files with those of your choice. Then repack the eboot. PIC1 must be 480x272 and ICON0 must be 144x80. for audio specs refer to viewtopic.php?f=3&t=77#p415, and a splash screen tut can be found at viewtopic.php?f=3&t=77
[spoiler]Henry's original eboot:
Download: http://www.mediafire.com/?zgdyznmzugm
Henry's second eboot from july with new savedata image included:
PIC0, PIC1, and ICON0 preview:

Savedata icon preview:

Download: http://www.mediafire.com/?3urdtbr3ilhq6hc[/spoiler]
[spoiler]These eboots add a new splash screen ad size reduction thanks to some clever hex edits.

The audio clip: http://www.aimini.net/view/?fid=wNJkfedSVSFo5x5f3mpO
Eboot downloads:
- v1.0 http://www.sendspace.com/file/92r0zr
v1.1 http://www.sendspace.com/file/0g7hc8
v2.0 http://www.sendspace.com/file/enm7xc
v2.1 http://www.sendspace.com/file/sxyiq3
[spoiler]Based upon cobaltex's mod but with new pic and icon.
Soul Eater mod
PIC1 preview

ICON0 preview

Download: http://www.megaupload.com/?d=CE0X1Z4Q[/spoiler]
[spoiler]Splash screen preview
PIC1 preview
ICON0 preview
Download: http://www.megaupload.com/?d=M8VYW7B0[/spoiler]
[spoiler]PIC1 Preview

ICON1 Preview
Note: The save data images are the same as above.
Download: http://www.mediafire.com/?oyi2nvolet8sb99[/spoiler]
[spoiler]PIC1 Preview

ICON1 Preview

Note: The save data images are the same as above.
Download: http://www.mediafire.com/?ud1u9t5qwl9tibl[/spoiler]
If I've missed anything let me know and I'll add it here to the op. Also feel free to share new custom eboots here. I'll add them as well.
