I'm back from a long, real-life induced rom hacking hiatus. I had been hoping to get a hack demo out for C3, but it came earlier than I was expecting and there just wasn't enough time.
Still, I thought I should put something out there so I present the Modern Spiny Pack
This pack contains a custom sprite spiny that behaves similar to the NSMBWii/NSMBU Spiny and a patch that will make Spiny Eggs thrown by Lakitus turn into the custom Spiny rather than the default SMW Spiny. If you wanted to, you could also make the Spiny Eggs turn into any other custom sprite and do something weird like that.
It also contains a second patch that will remap Buzzy Beetle tiles to allow Buzzy Beetles and Spinys to exist in the same level. Like so...
It's fairly simple code, but hopefully it will be quite useful. I know I've always found it annoying that SMW wouldn't let you place Buzzys and Spinys in the same level. Enjoy.
I have a hack thread - Link
(Now with a demo!)
Also a music thread - Link
2013: Modern Spiny Pack
Spring 2010: SMB2 Autobomb Sprite