Carp in little ponds like that are sometimes grass carp. I’ve had takes from grassies on berry patterns, green poppers, and “grass flies”. I’ve found them spookier than common carp, but I think carp behavior varies considerably among populations. I read a website claiming that grassies were quite willing to eat large streamer patterns?
For common carp, I’ve had some success recently on a simple pattern called “Mike’s Carp Candy Fly” tied in natural brown rabbit. I second the desiriability of having a fly that rides point up. I’ve also been using a 2-fly rig with something bright white or yellow as a 2nd fly. Sometimes these local carp will eat it; even when they don’t it works as an indicator
G